Addition and subtraction

There are 355 NRICH Mathematical resources connected to Addition and subtraction
Rabbits in the pen
problem

Rabbits in the pen

Age
7 to 11
Challenge level
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Using the statements, can you work out how many of each type of rabbit there are in these pens?
Dice and Spinner Numbers
problem

Dice and spinner numbers

Age
7 to 11
Challenge level
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If you had any number of ordinary dice, what are the possible ways of making their totals 6? What would the product of the dice be each time?
How Old?
problem

How old?

Age
7 to 11
Challenge level
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Cherri, Saxon, Mel and Paul are friends. They are all different ages. Can you find out the age of each friend using the information?
The 24 Game
problem

The 24 game

Age
7 to 11
Challenge level
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There are over sixty different ways of making 24 by adding, subtracting, multiplying and dividing all four numbers 4, 6, 6 and 8 (using each number only once). How many can you find?
And so on and so on
problem

And so on and so on

Age
11 to 14
Challenge level
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If you wrote all the possible four digit numbers made by using each of the digits 2, 4, 5, 7 once, what would they add up to?
A Rod and a Pole
problem

A rod and a pole

Age
7 to 11
Challenge level
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A lady has a steel rod and a wooden pole and she knows the length of each. How can she measure out an 8 unit piece of pole?
Spell by Numbers
problem

Spell by numbers

Age
7 to 11
Challenge level
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Can you substitute numbers for the letters in these sums?
Gift Stacks
problem

Gift stacks

Age
7 to 11
Challenge level
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Use the information to work out how many gifts there are in each pile.
All seated
problem

All seated

Age
7 to 11
Challenge level
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Look carefully at the numbers. What do you notice? Can you make another square using the numbers 1 to 16, that displays the same properties?
Function Machines
problem

Function machines

Age
7 to 11
Challenge level
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If the numbers 5, 7 and 4 go into this function machine, what numbers will come out?