Addition and subtraction

There are 355 NRICH Mathematical resources connected to Addition and subtraction
One Wasn't Square
problem
Favourite

One wasn't square

Age
7 to 11
Challenge level
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Mrs Morgan, the class's teacher, pinned numbers onto the backs of three children. Use the information to find out what the three numbers were.
The Deca Tree
problem
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The deca tree

Age
7 to 11
Challenge level
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Find out what a Deca Tree is and then work out how many leaves there will be after the woodcutter has cut off a trunk, a branch, a twig and a leaf.
Robot Monsters
problem
Favourite

Robot monsters

Age
5 to 7
Challenge level
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Use these head, body and leg pieces to make Robot Monsters which are different heights.
Dicey Addition
problem
Favourite

Dicey addition

Age
5 to 11
Challenge level
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Who said that adding couldn't be fun?
Countdown
game
Favourite

Countdown

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

Birthday Cakes
problem
Favourite

Birthday cakes

Age
5 to 7
Challenge level
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Jack's mum bought some candles to use on his birthday cakes and when his sister was born, she used them on her cakes too. Can you use the information to find out when Kate was born?
Highest and Lowest
problem
Favourite

Highest and lowest

Age
7 to 11
Challenge level
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Put operations signs between the numbers 3 4 5 6 to make the highest possible number and lowest possible number.
Reach 100
problem
Favourite

Reach 100

Age
7 to 11
Challenge level
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Choose four different digits from 1-9 and put one in each box so that the resulting four two-digit numbers add to a total of 100.

Cinema Problem
problem
Favourite

Cinema problem

Age
11 to 14
Challenge level
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A cinema has 100 seats. How can ticket sales make £100 for these different combinations of ticket prices?

Domino Pick
problem
Favourite

Domino pick

Age
5 to 7
Challenge level
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Are these domino games fair? Can you explain why or why not?