Addition and subtraction

There are 355 NRICH Mathematical resources connected to Addition and subtraction
More Less is More
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More less is more

Age
7 to 14
Challenge level
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In each of these games, you will need a little bit of luck, and your knowledge of place value to develop a winning strategy.
5 by 5 Mathdokus
problem
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5 by 5 Mathdokus

Age
7 to 16
Challenge level
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Can you use the clues to complete these 5 by 5 Mathematical Sudokus?

4 by 4 Mathdokus
problem
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4 by 4 Mathdokus

Age
7 to 14
Challenge level
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Can you use the clues to complete these 4 by 4 Mathematical Sudokus?

Three neighbours
problem
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Three neighbours

Age
7 to 14
Challenge level
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Take three consecutive numbers and add them together. What do you notice?
Equivalent Pairs
problem
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Equivalent pairs

Age
5 to 7
Challenge level
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Can you match pairs of cards which show the same amount?
Subtraction Slip
problem
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Subtraction slip

Age
5 to 7
Challenge level
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Can you spot the mistake in this video? How would you work out the answer to this calculation?
Fruity Pairs
problem
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Fruity pairs

Age
5 to 7
Challenge level
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Which two items of fruit could Kate and Sam choose? Can you order the prices from lowest to highest?

Digit Addition
problem
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Digit addition

Age
5 to 11
Challenge level
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Try out this number trick. What happens with different starting numbers? What do you notice?

Making a difference
problem
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Making a difference

Age
11 to 14
Challenge level
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How many different differences can you make?