Odd and even numbers

There are 75 NRICH Mathematical resources connected to Odd and even numbers
Number Round Up
problem
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Number round up

Age
5 to 7
Challenge level
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Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.
Carroll Diagrams
problem
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Carroll diagrams

Age
5 to 11
Challenge level
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Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?

Magnifying glass
problem
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Number detective

Age
5 to 11
Challenge level
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Follow the clues to find the mystery number.

Share Bears
problem
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Share bears

Age
5 to 7
Challenge level
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Yasmin and Zach have some bears to share. Which numbers of bears can they share so that there are none left over?
Grouping Goodies
problem
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Grouping goodies

Age
5 to 7
Challenge level
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Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?

Magic Vs
problem
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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?

Venn diagrams
problem
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Venn diagrams

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

Eightness of Eight
problem
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Eightness of eight

Age
5 to 7
Challenge level
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What do you see as you watch this video? Can you create a similar video for the number 12?
Always, Sometimes or Never?
problem
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Always, sometimes or never?

Age
5 to 11
Challenge level
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Are these statements relating to odd and even numbers always true, sometimes true or never true?