Addition and subtraction

problem
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The Dice Train

Age

7 to 11

Challenge level

3 out of 3

This dice train has been made using specific rules. How many different trains can you make?
problem
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Subtraction Surprise

Age

7 to 14

Challenge level

1 out of 3

Try out these calculations. Are you surprised by the results?
game
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Countdown

Age

7 to 14

Challenge level

1 out of 3

Here is a chance to play a version of the classic Countdown Game.
game
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Dicey Operations

Age

7 to 14

Challenge level

1 out of 3

In these addition and subtraction games, you'll need to think strategically to get closest to the target.
problem
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Consecutive Numbers

Age

7 to 14

Challenge level

1 out of 3

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

Age

7 to 14

Challenge level

1 out of 3

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.
problem
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4 by 4 Mathdokus

Age

7 to 14

Challenge level

1 out of 3

Can you use the clues to complete these 4 by 4 Mathematical Sudokus?
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More Less Is More

Age

7 to 14

Challenge level

1 out of 3

In each of these games, you will need a little bit of luck and your knowledge of place value to develop a winning strategy.
problem
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Sealed Solution

Age

7 to 14

Challenge level

2 out of 3

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?
problem
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Diagonal Sums

Age

7 to 14

Challenge level

2 out of 3

In this 100 square, look at the green square which contains the numbers 2, 3, 12 and 13. What is the sum of the numbers that are diagonally opposite each other? What do you notice?