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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Addition and Subtraction

### Strike it Out

### Fifteen Cards

### Consecutive Numbers

### Play to 37

### Build it Up

### Buying a Balloon

### Subtraction Surprise

### Super Shapes

### Space Distances

### Sealed Solution

### Got It

### Make 37

### Finding Fifteen

### Roll These Dice

### Maze 100

### Domino Square

### Six Ten Total

### Six Numbered Cubes

### Amy's Dominoes

### What Distance?

### Twenty Divided Into Six

### Reach 100

### Dice in a Corner

### 4 Dom

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These activities are part of our Primary collections, which are problems grouped by topic.

Age 5 to 11

Challenge Level

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

Age 7 to 11

Challenge Level

Can you use the information to find out which cards I have used?

Age 7 to 14

Challenge Level

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

Age 7 to 11

Challenge Level

In this game for two players, the idea is to take it in turns to choose 1, 3, 5 or 7. The winner is the first to make the total 37.

Age 7 to 11

Challenge Level

Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.

Age 7 to 11

Challenge Level

Lolla bought a balloon at the circus. She gave the clown six coins to pay for it. What could Lolla have paid for the balloon?

Age 7 to 14

Challenge Level

Try out some calculations. Are you surprised by the results?

Age 7 to 11

ShortChallenge Level

The value of the circle changes in each of the following problems. Can you discover its value in each problem?

Age 7 to 11

Challenge Level

This task focuses on distances travelled by the asteroid Florence. It's an opportunity to work with very large numbers.

Age 7 to 11

Challenge Level

Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?

Age 7 to 14

Challenge Level

A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.

Age 7 to 11

Challenge Level

Four bags contain a large number of 1s, 3s, 5s and 7s. Can you pick any ten numbers from the bags so that their total is 37?

Age 7 to 11

Challenge Level

Tim had nine cards each with a different number from 1 to 9 on it. How could he have put them into three piles so that the total in each pile was 15?

Age 7 to 11

Challenge Level

Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?

Age 7 to 11

Challenge Level

Can you go through this maze so that the numbers you pass add to exactly 100?

Age 7 to 11

Challenge Level

Use the 'double-3 down' dominoes to make a square so that each side has eight dots.

Age 7 to 11

Challenge Level

This challenge combines addition, multiplication, perseverance and even proof.

Age 7 to 11

Challenge Level

This task combines spatial awareness with addition and multiplication.

Age 7 to 11

Challenge Level

Amy has a box containing domino pieces but she does not think it is a complete set. Which of her domino pieces are missing?

Age 7 to 11

Challenge Level

Can you use addition and subtraction to answer these questions about real-life distances?

Age 7 to 11

Challenge Level

Katie had a pack of 20 cards numbered from 1 to 20. She arranged the cards into 6 unequal piles where each pile added to the same total. What was the total and how could this be done?

Age 7 to 11

Challenge Level

Choose four different digits from 1-9 and put one in each box so that the resulting four two-digit numbers add to a total of 100.

Age 7 to 11

Challenge Level

How could you arrange at least two dice in a stack so that the total of the visible spots is 18?

Age 5 to 11

Challenge Level

Use these four dominoes to make a square that has the same number of dots on each side.