Addition and subtraction

There are 355 NRICH Mathematical resources connected to Addition and subtraction
Five Steps to 50
problem
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Five steps to 50

Age
5 to 7
Challenge level
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Use five steps to count forwards or backwards in 1s or 10s to get to 50. What strategies did you use?
Unit Differences
problem
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Unit differences

Age
5 to 7
Challenge level
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This challenge is about finding the difference between numbers which have the same tens digit.
What Could \It Be?
problem
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What could it be?

Age
5 to 7
Challenge level
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In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?
Two Spinners
problem
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Two spinners

Age
5 to 7
Challenge level
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What two-digit numbers can you make with these two dice? What can't you make?
Play to 37
problem
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Play to 37

Age
7 to 11
Challenge level
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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.
How Much Did it Cost?
problem
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How much did it cost?

Age
7 to 11
Challenge level
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Use your logical-thinking skills to deduce how much Dan's crisps and ice-cream cost altogether.

Ring of Numbers
problem
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Ring of numbers

Age
5 to 7
Challenge level
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Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
Up, down, flying around
game
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Up, down, flying around

Play this game to learn about adding and subtracting positive and negative numbers

Strange Bank Account
problem
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Strange bank account

Age
11 to 14
Challenge level
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Imagine a very strange bank account where you are only allowed to do two things...

Dice in a Corner
problem
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Dice in a corner

Age
7 to 11
Challenge level
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How could you arrange at least two dice in a stack so that the total of the visible spots is 18?