Addition and subtraction

There are 355 NRICH Mathematical resources connected to Addition and subtraction
Magic Vs
problem
Favourite

Magic vs

Age
7 to 11
Challenge level
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Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?

I'm Eight
problem
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I'm eight

Age
5 to 11
Challenge level
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Find a great variety of ways of asking questions which make 8.
Five Coins
problem
Favourite

Five coins

Age
5 to 11
Challenge level
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Ben has five coins in his pocket. How much money might he have?
What's in a Name?
problem
Favourite

What's in a name?

Age
5 to 7
Challenge level
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What do you notice about these squares of numbers? What is the same? What is different?
Cuisenaire Counting
problem
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Cuisenaire counting

Age
5 to 7
Challenge level
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Here are some rods that are different colours. How could I make a yellow rod using white and red rods?
Making Longer, Making Shorter
problem
Favourite

Making longer, making shorter

Age
5 to 7
Challenge level
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Ahmed is making rods using different numbers of cubes. Which rod is twice the length of his first rod?

Sitting round the party tables
problem
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Sitting round the party tables

Age
5 to 11
Challenge level
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Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.
Carrying Cards
problem
Favourite

Carrying cards

Age
7 to 11
Challenge level
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These sixteen children are standing in four lines of four, one behind the other. They are each holding a card with a number on it. Can you work out the missing numbers?
Strike it out
problem
Favourite

Strike it out

Age
5 to 11
Challenge level
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Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.

Pairs of Numbers
problem
Favourite

Pairs of numbers

Age
5 to 7
Challenge level
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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?