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An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

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Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?

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Use the 'double-3 down' dominoes to make a square so that each side has eight dots.

Coded Hundred Square

Age 7 to 11 Challenge Level:

Where could you start?
What might the first numbers look like?
What might the last number look like?
What do you know about the multiples of $11$?
What will be the same in each column?
What will be the same for the first nine numbers in each row?