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Age 7 to 11 Challenge Level:
Take three numbers that are 'next door neighbours' when you count. These are called consecutive numbers.
Add them together.
What do you notice?
Take another three consecutive numbers and add them together.
What do you notice?
Can you prove that this is always true by looking carefully at one of your examples?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.