Matemáticas de 2.º curso

In Year 2, children learn to add two two-digit numbers within 100 where the ones digits add up to 10 or more (such as 37 + 25). They split numbers into tens and ones, bridge through the next multiple of ten, and combine the amounts to reach the final sum.

A common mistake occurs when children do not exchange ten ones for a ten. Instead of regrouping, they often write down the entire two-digit ones total side-by-side with the tens—for example, recording 48 + 27 as 615 because 4 + 2 is 6 and 8 + 7 is 15. Other times, they simply forget to add the extra ten to the tens column, giving an answer of 65.

Practice tasks guide children through this process with varied activities. Children might bridge through ten to complete a calculation, balance both sides of an equation, spot and correct errors in ready-made sums, or solve word problems that involve changes or include an extra, unnecessary number.

In Year 2, children build confidence adding numbers up to 100. They work on adding a single-digit number (ones) to a two-digit number, as well as combining two two-digit numbers. At this stage, they apply both mental shortcuts and written methods, moving away from counting one by one to using their understanding of tens and ones.

A common stumbling block occurs when an addition crosses a tens boundary (such as 47 + 5). Children often lose track when bridging to the next ten, or they accidentally add the ones digit directly to the tens column, turning 34 + 5 into 84 instead of 39. Miscounting jumps when using visual tools is another frequent slip.

Practice tasks offer visual and structured problem-solving, including:

• using number lines and jumping on the hundred grid to track steps forward;
• solving number pyramids and cracking puzzles like the addition code;
• spotting errors in tasks like correct the mistake or checking is the total right?

In Year 2, children move beyond subtracting within 20 to subtract two two-digit numbers within 100. They read, write, and interpret mathematical statements using the minus (–) and equals (=) signs, working out how many remain when taking away tens and ones.

A common error happens when a calculation crosses a multiple of ten. When the ones digit being subtracted is larger than the starting number's ones digit (such as in 52 – 17), children frequently flip the digits and subtract the smaller from the larger (calculating 7 – 2 instead). They can also lose track of the count when jumping backwards past a tens boundary.

Worksheet tasks reinforce this skill through visual methods, such as jumping back on a hundred grid and breaking down problems step by step. Children also practise finding and correcting mistakes in someone else's work, working out two subtractions in a row, and solving real-life word problems, such as finding how many items were there at the start or calculating what remains after some leave and others arrive.

In Year 2, children learn to compare and order numbers from 0 up to 100. Building on language such as more than, less than, and equal to, they record relationships between values using the mathematical symbols <, >, and =. They look at the tens and ones in two-digit numbers to decide which value is larger or to sequence several numbers from least to greatest.

A frequent stumbling block is confusing the < and > signs or reversing their meaning. Children also commonly look at the ones digit before the tens digit—for instance, incorrectly judging 38 to be larger than 51 simply because 8 is larger than 1.

Worksheets provide direct practice with tasks like Insert the sign: <, > or = and Comparing numbers within 100. Children also solve combined problems such as Compute, then insert the sign, arrange values in tasks like Order five numbers, or explore digits that satisfy an inequality using List the digits that fit.

In Year 2, children learn to order and arrange combinations of mathematical objects in patterns and sequences. They explore sequences that move in regular steps, figuring out how much a pattern grows each time or continuing a countdown rhythm where numbers decrease steadily.

A common error occurs when children assume every sequence changes by one, or when they miscalculate the size of the jump between numbers. Pupils also frequently struggle when working backwards: when tasked with finding a missing number in the middle or identifying the very first term, they often add when they should subtract, continuing the forward rhythm rather than reversing it.

Practice tasks guide children to analyse patterns through exercises such as:

• Deciding whether a statement about the next term is true or false, or picking the next correct term from a list.
• Finding missing numbers located at the start, in the middle, or further along the sequence.
• Identifying errors to correct a wrongly continued sequence, or comparing two different patterns to determine which grows faster and by how much.

In Year 2, children learn to calculate division facts and write them as mathematical statements using the division (÷) and equals (=) signs. While recall of other tables like the 3, 4, 8, or up to 12 × 12 comes in later years, children at this stage focus on dividing within the 2, 5 and 10 times tables for numbers up to 100.

A frequent stumbling block is reversing the numbers in a written division sentence. Because multiplication works in any order, children often mistakenly write the smaller number first (such as writing 5 ÷ 20 = 4 instead of 20 ÷ 5 = 4), mixing up the total starting amount with the number of groups.

Tasks build confidence by connecting division to everyday grouping and sharing. Children work on practical word problems like How many packs will there be and Share into equal parts, solve missing-number questions such as What was it divided by, and spot calculation errors in Check the division and find the mistake.

In Year 2, children build on recognising individual coins and notes by using the symbols for pounds (£) and pence (p). At this stage, they find different combinations of coins that equal the same amount of money and solve practical word problems. They add and subtract amounts within the same unit—such as adding pence to pence—to find the total cost of items and calculate the correct change.

A common difficulty is confusing the physical number of coins with their total value. For example, a child might assume that four 2p coins are worth more than a single 10p coin simply because there are more coins. When working out change, children also tend to struggle if they try to subtract mentally without using number bonds or counting on, often confusing how much was spent with how much is left over.

Worksheet activities reflect real-world shopping scenarios. Typical tasks include:

• Which coins to pay with and Is there enough money, where children select the correct coins or check if a given set covers a price;
• How much do several items cost and How much is still missing, which practise adding prices together and finding the difference;
• Shopping and change and Change: fix the mistake, where pupils calculate remaining money or identify errors in transactions.

Children learn to navigate a calendar and use date vocabulary, building on their knowledge of days of the week, weeks, and months. In Year 2, they practice finding future and past days (such as working out what day it will be in four days or what day it was three days ago) and counting how many days pass between two given dates on a calendar.

A common mistake is an off-by-one counting error. When calculating how many days pass between two dates, children frequently count the start date as "day one" rather than counting the jumps or intervals between the days. They can also lose track when counting backwards across the start of a week.

Practice tasks use printed calendar strips and monthly grids. Exercises include questions like Which day of the week will it be, finding How many days between the marked dates, answering true-or-false questions about elapsed days, and finding errors in sample answers using Correct the mistake in counting days.

In Year 2, children build on reading the clock to five minutes by measuring, comparing, and sequencing periods of time. They learn foundational facts, specifically that there are 60 minutes in an hour and 24 hours in a day. Using this knowledge alongside counting in 5s and 10s, pupils work out how many minutes have passed between events, calculate start times, and convert whole hours into minutes.

A common difficulty occurs when children treat time like standard numbers based on 100 rather than 60. When working out durations or converting hours to minutes, pupils often mistakenly assume an hour has 100 minutes, which leads to errors when bridging past an hour. Children also frequently mix up terms such as earlier and later when required to calculate backwards to find when an activity began.

Worksheet activities apply these concepts through simple everyday routines. In The day plan: put the times in order, children sequence different scheduled events. Other tasks, such as Time duration (how long?), How many minutes have passed?, and How much longer one lasted than the other, prompt pupils to calculate time spans or determine which activity was quicker. Tasks also include quick checks like true-or-false questions and matching exercises to convert hours into minutes.

In Year 2, children learn to solve missing number problems involving addition and subtraction with two-digit numbers up to 100. Rather than simply calculating the end result of a sum, they use the inverse relationship between addition and subtraction to work out a hidden value represented by an empty box, such as finding a missing addend or determining what number was originally taken from in a subtraction.

A common stumbling block is seeing the equals sign as an instruction to calculate rather than a symbol of equality. When faced with an equation like 7 = □ – 9 or 14 + □ = 20, children often add the two visible numbers together because they expect the answer to follow the calculation, overlooking that they must use the opposite operation to keep both sides balanced.

Practice tasks introduce these missing numbers across varied layouts:

• Missing addends: working out the hidden number in equations with two or three numbers.
• Subtraction boxes: identifying the starting number before an amount was deducted.
• Balanced scales: figuring out the weight of a hidden block to ensure both sides of an equation are equal.

In Year 2, children learn to recall and use multiplication facts for the 2, 5, and 10 times tables, reaching products up to 100. They build understanding through practical representations, connecting equal groups and arrays of dots to repeated addition and formal multiplication sentences using the × and = signs.

A frequent error occurs when children misinterpret the structure of equal groups, confusing the number of groups with the size of each group (such as mixing up five groups of two with two groups of five). Children also tend to rely solely on skip-counting from zero rather than recalling known facts directly, which often leads to tracking errors on higher multiples of 5 or 10.

Practice tasks reinforce these concepts by asking children to count totals in How many dots in the array, calculate Equal groups altogether, or fill in a Missing factor. Other activities challenge them to compare statements to see Which product is larger and by how much, or inspect worked examples to Check the multiplication and find the mistake.

In Year 2, children learn to measure temperature to the nearest appropriate unit using thermometers marked in degrees Celsius (°C). Using their knowledge of counting in steps of 1, 2, 5, and 10 up to 100, they observe the level of the liquid against the vertical number scale and determine the temperature shown.

A frequent error occurs when children misinterpret unlabelled interval marks on the scale. For example, on a scale numbered in tens with tick marks every two degrees, a child might count each notch as one degree instead of determining the value of the step. Children also sometimes read down from the top rather than counting up from zero.

Practice tasks feature vertical thermometer diagrams in everyday formats. Children read a temperature directly, choose the correct value from options, or answer true-or-false questions about a reading. Other activities ask them to identify which reading is warmer, correct a mistaken reading, or calculate how much a temperature has risen.

In Year 2, children discover that addition and multiplication are commutative—meaning two numbers can be added or multiplied in any order without changing the result (such as 3 + 5 = 5 + 3). At the same time, they learn that subtraction and division cannot be reversed. They put this into practice when adding three one-digit numbers, rearranging the numbers into a handy order to make the mental arithmetic quicker, such as finding pairs that make 10 first.

A common stumble occurs when children assume that subtraction can also be done in any order, mistakenly treating 8 - 2 and 2 - 8 as identical. Another frequent hurdle is calculating rigidly from left to right, missing easy shortcuts—such as adding 2 + 9 + 8 in order instead of combining 2 and 8 first.

Practice tasks ask pupils to spot equivalent expressions where sides are swapped, select the easiest path to a total in Choose the convenient order, or decide whether a regrouped sum is true or false. Children also work on finding two convenient pairs among four terms and writing out how they added numbers the easy way.

In Year 2, children learn to interpret categorical data shown in simple tables and bar charts, working with numbers up to 100. They count the items in each category, sort groups by quantity, and answer questions about totalling and comparing by using addition and subtraction.

A common mistake occurs with comparison questions such as "how many more?" Instead of calculating the difference between two rows or bars, children often simply state the value of the larger group. Children also frequently misread across rows or lines on a chart, leading them to pull data from the wrong category.

Practice tasks present straightforward charts and tables to solve one-step problems. Concrete activities include identifying which category has the most, finding the gap between the largest and the smallest, counting how many groups are above the given number, and working out the difference between two rows through true-or-false or multiple-choice questions.

Children learn to add and subtract multiples of 100, applying familiar addition and subtraction facts to work with three-digit numbers. At this stage, they practice counting forwards and backwards in steps of 100, combining multiple jumps in sequence, and calculating the result of adding or taking away full hundreds.

A frequent error occurs when children confuse place value columns. A child might treat a jump of 100 as adding 1 or 10, altering the ones or tens digit instead of the hundreds. Children can also lose count when combining two jumps in a row, such as miscalculating the total added when jumping forward 100 and then another 200.

Worksheet tasks visually reinforce these steps using number lines and balance problems. Typical exercises include jumping forward or backward by full hundreds, deciding how many hundreds were added to reach a total, choosing the correct result from multiple options, finding missing values to make both sides of an equation equal, and spotting and fixing calculation mistakes.

In Year 2, children recognise, find, name, and write fractions including 1/2, 1/4, 2/4, and 3/4. They work with lengths, shapes, and sets of objects, learning to write equations like 1/2 of 6 = 3 and seeing that 2/4 is the same as 1/2.

A common error is ignoring the need for equal parts. When looking at shapes or groups of items, children often count the number of slices or groups without checking that each part has the exact same size or quantity, or they confuse the shaded parts with the parts left unshaded.

Practice tasks ask children to find one part of a set, choose the correct value for a given fraction, or determine whether statements about unshaded parts are true or false. Children also identify and fix mistakes in unevenly split sets, calculate the total amount when given the value of one part, and invent their own sets that divide into equal halves and quarters.

At this stage, children add one-digit and two-digit numbers up to 20 where the ones do not bridge over a ten (such as 13 + 4 = 17 or 11 + 5 = 16), including adding zero. They read and write equations using the + and = symbols, moving away from counting everything from 1 toward using known number bonds to combine the numbers quickly.

A common error occurs when children count on using their fingers and include the starting number in the count—for example, solving 14 + 3 by saying "14, 15, 16" and landing on 16 instead of 17. Other times, children mix up tens and ones, mistakenly adding a single-digit number to the tens column instead of the ones column.

Worksheet tasks present these calculations through varied formats. Children might count filled spots on two ten-frames to visualise the numbers, find missing values, or solve equations with two or three numbers. Other activities ask them to decide whether a completed number sentence is true or false, spot and correct an addition mistake, or pick the correct total from multiple-choice options.

In Year 2, children learn that addition and subtraction are inverse operations that undo one another. Building on facts within 20 and working with two-digit numbers, they use this relationship to check their calculations and solve missing number problems, such as figuring out what starting number an amount was subtracted from.

A common mistake occurs when checking a subtraction. Children often remember that they need to add, but they add the starting total to the answer instead of adding the two smaller parts together. Because they lose track of the relationship between the whole and its parts, they can end up with an even larger number rather than confirming the original total.

Practice tasks ask children to check an addition using subtraction or check a subtraction by adding. Other exercises present a completed calculation and ask whether the check is right, challenge pupils to correct a mistake in a check, or require them to work backwards to find what number was subtracted or how many items were there before sharing.

At this stage, children build confidence using standard metric units to measure length and height. They practice reading exact measurements directly from a ruler in centimetres and millimetres. They also explore how these units relate to one another by converting mixed measurements, such as changing metres and centimetres into total centimetres, or changing centimetres and millimetres into millimetres.

A frequent mistake happens when children line up objects against a ruler. Instead of starting from the 0 mark, they often line up the edge of an item with the physical end of the ruler or start counting from 1, which leads to an inaccurate measurement. When converting units, children may also confuse the multiples, forgetting how many millimetres make up a single centimetre.

Worksheet tasks give children practical ways to rehearse these measurements, including:

• Reading the length shown along a ruler to the nearest mark.
• Converting mixed lengths, such as metres and centimetres to centimetres, or centimetres and millimetres to millimetres.
• Evaluating measurements through true or false and fix the mistake questions.
• Selecting the correct conversion between centimetres and millimetres from multiple choices.

In Year 2, children solve one-step practical problems using addition and subtraction with numbers up to 100. Using objects, pictures, or mental methods, they read a short scenario and determine what calculation is needed—such as finding a combined total, working out how many items are left after some are taken away, or reasoning backwards to discover how many there were at the start.

A common mistake is automatically adding every number found in the text without picturing the situation. When a question includes an extra, irrelevant number or asks about the starting amount, children often struggle to choose the correct operation because they scan for keywords rather than understanding the relationship between the quantities.

Worksheet tasks practice these skills through short scenarios. Children might be asked to identify which operation solves the problem (such as finding amounts altogether), calculate how many are left (including trickier questions with an extra number to filter out), or choose the correct final result from several options.

In Year 2, children learn to identify and name flat 2-D shapes, focusing on circles, triangles, and rectangles (including squares). They identify these figures by looking at basic properties, such as counting the number of straight sides, and learn to recognise them across different sizes and orientations.

A common difficulty occurs when a familiar shape is rotated. For example, children frequently misidentify a square turned onto its point as a "diamond" or fail to recognise an inverted triangle, because they rely on the shape resting on a flat, horizontal base rather than counting its sides.

Practice tasks reinforce this by presenting shapes at unusual angles:

• naming drawn figures and rotated shapes;
• answering true-or-false questions about whether a shape is correctly identified;
• finding and counting shapes within a composite drawing, such as counting triangles in a picture;
• spotting mistakes and correcting the name of a mislabelled figure.

In Year 2, children build on reading and writing numbers to at least 100 in both numerals and words as they begin exploring three-digit numbers up to 1000. They learn to match spoken and written words directly to digits, connecting each part of a number name to hundreds, tens, and ones.

A common mistake happens when a number contains a zero in the tens column. When translating a number like "five hundred and four" into digits, children often write 5004 by writing out the full number 500, or they skip the placeholder entirely and write 54.

Practice tasks help children spot and correct these errors. Children read numbers in words, write them in digits, and complete focused activities such as zero in the middle: fix how the number is written, choosing the correct way of writing a number in digits, or deciding whether a written number is correct.

In Year 2, children build on reading hours and half hours by learning to tell and write the time to five minutes. This includes mastering quarter past and quarter to, as well as counting around the clock face in five-minute steps (such as 25 minutes past or 10 minutes to the hour). They practice both reading analogue clock dials and drawing hands onto blank clock faces.

A common mistake occurs once the minute hand moves past the half-hour mark. Because the shorter hour hand slowly moves toward the next number, children often read the approaching hour too early—mistaking 3:50 for 4:50. Many also confuse the clock numbers with the minute count, thinking the minute hand pointing at the 4 means four minutes past rather than twenty.

Practice tasks use clear analogue clock faces to test these skills without digital conversions. Children encounter activities such as:

• looking at a dial to choose the correct time or judging whether a written statement is true or false;
• spotting and correcting mistakes in clock readings;
• working out how many minutes remain until the full hour;
• comparing two clock faces to identify which one shows the earlier time.

In Year 2, children learn to choose and use standard units—litres and millilitres—to measure and estimate capacity using measuring vessels. At this stage, pupils work primarily with whole litres and half-litres, comparing how much different containers hold and calculating how many smaller containers are needed to fill a larger one.

A common error occurs when children treat half-litres as whole units. For example, when asked how many litres four half-litre bottles make, they may count the bottles directly and answer four litres instead of combining pairs of halves to make two litres. Children also sometimes struggle to find the difference between two volumes, confusing the remaining empty space with the liquid already inside.

Practice tasks use concrete scenarios with bottles, jugs, and cartons. Typical activities ask children to determine how many bottles the juice will fill, calculate how many full litres come from a set number of half-litre containers, or find how much more one container holds than the other.

In Year 2, children build on basic counting by jumping in equal steps. They learn to count forwards and backwards in steps of 2, 3, and 5 starting from 0. They also practice counting in tens starting from any number, such as counting 14, 24, 34, and backwards again.

A common difficulty occurs when counting in tens from a number that does not end in zero. Children often slip back into familiar ten-boundaries, switching from 23, 33... to 40, 50 instead of continuing to 43. Counting backwards in steps of 3 or 5 also poses a challenge, as children may lose track of the step size when crossing beneath a multiple of ten.

Worksheet activities reinforce these patterns through clear, practical exercises. Tasks include spotting and correcting an incorrect number in a sequence, continuing a pattern of equal steps forwards or backwards, choosing the next number in a sequence, and working out how many equal jumps are needed to reach a target number.

In Year 2, children build on simple descriptions like longer or lighter to directly compare and order measurements. They look at multiple objects to identify the longest or shortest item, arrange items from lightest to heaviest, and find the exact difference between two lengths to work out how much longer one object is than another. They also record these comparisons using the mathematical symbols >, <, and =.

A common mistake occurs when children focus only on the end points of objects without checking that they share a common starting line. When calculating how much longer an item is, children also frequently confuse finding the difference with simply reading the total length of the longer object, forgetting to subtract the length of the shorter one.

Practice tasks present clear visual problems using real-world items. Children might look at a set of objects and complete tasks like Put them in order from lightest or identify Which one is the longest. Other activities present two ribbons side by side, asking pupils to calculate How much longer is the ribbon or evaluate a statement in How much longer: true or false.

In Year 2, children learn to identify common 3-D shapes such as cubes, cuboids, pyramids, cylinders, and spheres. They look closely at their features, counting the number of flat or curved faces, straight or curved edges, and sharp vertices (corners). They also identify familiar 2-D shapes sitting on the surfaces of these solids, such as finding a circle on the flat face of a cylinder or triangles on a pyramid.

A frequent stumbling block is confusing 2-D shape names with 3-D shape names. Children often call a cube a "square" or a sphere a "circle". They can also struggle to count features on printed pictures, frequently missing hidden edges and faces that are not visible from the front view, or mixing up the terms edges and vertices.

Worksheet tasks build confidence through questions such as What is this solid called, Which solid is it? Choose, and Correct the name of the solid. Children also link geometry to the real world in tasks like Find an object shaped like the solid, and test their understanding of properties using Which solid is it? True or false.

In Year 2, children read and interpret simple tables, tally charts, block diagrams, and pictograms. They move beyond basic one-to-one counting and begin reading pictograms where one picture stands for several items, using their knowledge of the 2, 5, and 10 times tables to count up values. They also add two-digit numbers up to 100 to find combined totals across rows and columns.

A common mistake occurs when children ignore the key in a pictogram. They often count each picture as 1 rather than checking if each symbol stands for 2, 5, or 10. In tables, children also mix up row totals with column totals, or forget to subtract when working backwards from a known total to find a missing number.

Practice tasks include:

• Finding how many altogether across the rows of a table.
• Deciding whether a statement about a table total is true or false.
• Reading a pictogram where one symbol represents several items to find the value of a group.
• Calculating a missing row value when the grand total is already given.
• Selecting the correct answer for a table total from multiple choices.

In Year 2, children build on simple comparisons of mass to choose and use standard units, focusing on kilograms and grams to measure how heavy objects are. Working within numbers up to 100, pupils learn to read scales to the nearest unit, convert whole kilograms into smaller units, and calculate how much more weight is needed to make up a full kilogram.

A frequent stumbling block is confusing unit values when converting. Children often treat mass units as standard base-ten steps and may assume one kilogram equals 10 or 100 smaller units rather than using the correct conversion factor, or they struggle to subtract an existing amount from a full kilogram to find the missing part.

Practice tasks range from quick checks to simple word problems. Children complete true-or-false challenges and multiple-choice questions on converting kilograms to decagrams, work out how many smaller portions can be made from a packaged weight, and calculate the exact missing mass needed to complete a full kilogram.

At this stage, children learn to look at any two-digit number up to 100 and identify what each digit represents. They understand that a number like 47 is made up of 4 tens (40) and 7 ones (7), rather than just two separate single digits sitting side by side. Recognising this structure helps them use place value facts to solve everyday number problems.

A common mistake occurs when children mix up the positions of the digits or misinterpret their values. For example, when looking at 35, a child might say the 3 is worth just 3 instead of 30, or they may reverse the digits and read it as 53. This usually happens when they see the digits as isolated numbers rather than recognising that the left position shows groups of ten.

Practice tasks focus on breaking down two-digit numbers and counting groups of ten. Using templates like Tens and ones and How many full tens?, children identify the exact number of tens and ones in a given value and work out how many complete groups of ten can be made from a two-digit total.

In Year 2, children learn to recognise odd and even numbers alongside learning their 2 times table. At this stage, they explore the core property of even numbers: that every even number can be divided into two equal groups or made from two identical whole numbers added together.

A frequent stumbling block is when children attempt to split an odd number into two equal whole numbers and become confused by the one left over. Children can also look at the tens digit rather than the ones digit when deciding whether a two-digit number is odd or even.

Worksheet tasks give children concrete practice by writing an even number as two equal addends. A typical question asks children to break down an even number into two identical parts, such as writing 14 as 7 + 7, proving it is even.

In Year 2, children learn to represent numbers up to 100 on a number line using steps of ten. They use their knowledge of tens and ones to move along the line, recognizing that each jump of ten changes only the tens digit while the ones digit remains constant.

A common error happens when children count the individual tick marks rather than the intervals between them, causing them to land one step short or one step too far. Another frequent mistake is confusing jumps of ten with jumps of one, such as moving from 23 to 24 instead of jumping directly to 33.

Worksheet tasks using the Jump by tens on the number line template present a number line with marked intervals. Children are given a starting point and draw or trace curved jumps of 10, writing in the missing numbers where each jump lands to reach a target value.