Odd and even numbers

There are 75 NRICH Mathematical resources connected to Odd and even numbers
Venn diagrams
problem
Favourite

Venn diagrams

Age
5 to 11
Challenge level
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How will you complete these interactive Venn diagrams?

Ring a Ring of Numbers
problem
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Ring a 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.
Lots of Biscuits!
problem
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Lots of biscuits!

Age
5 to 7
Challenge level
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Help share out the biscuits the children have made.

More Numbers in the Ring
problem
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More numbers in the ring

Age
5 to 7
Challenge level
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If there are 3 squares in the ring, can you place three different numbers in them so that their differences are odd? Try with different numbers of squares around the ring. What do you notice?
Even and odd
problem
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Even and odd

Age
5 to 7
Challenge level
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This activity is best done with a whole class or in a large group. Can you match the cards? What happens when you add pairs of the numbers together?
Number Differences
problem
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Number differences

Age
7 to 11
Challenge level
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Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?
I Like ...
problem
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I like ...

Age
5 to 7
Challenge level
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Mr Gilderdale is playing a game with his class. What rule might he have chosen? How would you test your idea?
Our Numbers
problem
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Our numbers

Age
5 to 7
Challenge level
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These spinners will give you the tens and unit digits of a number. Can you choose sets of numbers to collect so that you spin six numbers belonging to your sets in as few spins as possible?

Odds and Evens
problem
Favourite

Odds and evens

Age
11 to 14
Challenge level
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Are these games fair? How can you tell?
Make 37 Poster
problem
Favourite

Make 37

Age
5 to 11
Challenge level
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Four bags contain a large number of 1s, 3s, 5s and 7s. Can you pick any ten numbers from the bags so that their total is 37?