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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Addition and Subtraction KS1

### How Many?

### Arranging Additions and Sorting Subtractions

### Domino Sorting

### One Big Triangle

### Subtraction Slip

### Pairs of Numbers

### Butterfly Flowers

### Number Lines

### Two Spinners

### The Add and Take-away Path

### What Could It Be?

### Two Dice

### Unit Differences

### Cuisenaire Counting

### What's in a Name?

### Sort Them Out (1)

### Number Balance

### What Was in the Box?

### Ladybirds in the Garden

### Secret Number

### Eggs in Baskets

### Birthday Cakes

### Find the Difference

### Noah

### Heads and Feet

### Jumping Squares

### Number Round Up

### The Brown Family

### The Tall Tower

### 2, 4, 6, 8

### Totality

### Doing and Undoing

### Sitting Round the Party Tables

### How Do You See It?

### Half Time

### Strike it Out

Y*ou may also be interested in this collection of activities from the STEM Learning website, that complement the NRICH activities above.*

Or search by topic

This collection is one of our Primary Curriculum collections - tasks that are grouped by topic.

Age 5 to 7

Challenge Level

This project challenges you to work out the number of cubes hidden under a cloth. What questions would you like to ask?

Age 5 to 7

Challenge Level

Order these four calculations from easiest to hardest. How did you decide?

Age 5 to 7

Challenge Level

Try grouping the dominoes in the ways described. Are there any left over each time? Can you explain why?

Age 5 to 7

Challenge Level

Make one big triangle so the numbers that touch on the small triangles add to 10.

Age 5 to 7

Challenge Level

Can you spot the mistake in this video? How would you work out the answer to this calculation?

Age 5 to 7

Challenge Level

If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10? Which ones do you have to leave out? Why?

Age 5 to 7

Challenge Level

Can you find two butterflies to go on each flower so that the numbers on each pair of butterflies adds to the number on their flower?

Age 5 to 7

Challenge Level

A resource to try once children are familiar with number lines, and they have begun to use them for addition. It could be a good way to talk about subtraction. Leah and Tom each have a number line. Can you work out where their counters will land?

Age 5 to 7

Challenge Level

What two-digit numbers can you make with these two dice? What can't you make?

Age 5 to 7

Challenge Level

Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?

Age 5 to 7

Challenge Level

In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?

Age 5 to 7

Challenge Level

Find all the numbers that can be made by adding the dots on two dice.

Age 5 to 7

Challenge Level

This challenge is about finding the difference between numbers which have the same tens digit.

Age 5 to 7

Challenge Level

Here are some rods that are different colours. How could I make a yellow rod using white and red rods?

Age 5 to 7

Challenge Level

What do you notice about these squares of numbers? What is the same? What is different?

Age 5 to 7

Challenge Level

Can you each work out the number on your card? What do you notice? How could you sort the cards?

Age 5 to 7

Challenge Level

Can you hang weights in the right place to make the the number balance balanced?

Age 5 to 7

Challenge Level

This big box adds something to any number that goes into it. If you know the numbers that come out, what addition might be going on in the box?

Age 5 to 7

Challenge Level

In Sam and Jill's garden there are two sorts of ladybirds with 7 spots or 4 spots. What numbers of total spots can you make?

Age 5 to 7

Challenge Level

Annie and Ben are playing a game with a calculator. What was Annie's secret number?

Age 5 to 7

Challenge Level

There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs. How many eggs are in each basket?

Age 5 to 7

Challenge Level

Jack's mum bought some candles to use on his birthday cakes and when his sister was born, she used them on her cakes too. Can you use the information to find out when Kate was born?

Age 5 to 7

Challenge Level

Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.

Age 5 to 7

Challenge Level

Noah saw 12 legs walk by into the Ark. How many creatures did he see?

Age 5 to 7

Challenge Level

On a farm there were some hens and sheep. Altogether there were 8 heads and 22 feet. How many hens were there?

Age 5 to 7

Challenge Level

In this problem it is not the squares that jump, you do the jumping! The idea is to go round the track in as few jumps as possible.

Age 5 to 7

Challenge Level

Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.

Age 5 to 7

Challenge Level

Use the information about Sally and her brother to find out how many children there are in the Brown family.

Age 5 to 7

Challenge Level

As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?

Age 5 to 7

Challenge Level

Using the cards 2, 4, 6, 8, +, - and =, what number statements can you make?

Age 5 to 11

Challenge Level

This is an adding game for two players. Can you be the first to reach the target?

Age 5 to 11

Challenge Level

An investigation looking at doing and undoing mathematical operations focusing on doubling, halving, adding and subtracting.

Age 5 to 11

Challenge Level

Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.

Age 5 to 11

Challenge Level

Here are some short problems for you to try. Talk to your friends about how you work them out.

Age 5 to 11

Challenge Level

What could the half time scores have been in these Olympic hockey matches?

Age 5 to 11

Challenge Level

Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.

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