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Consecutive Numbers

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

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

Sealed Solution

Age 7 to 11
Challenge Level

A set of ten cards, each showing one of the digits from $0$ to $9$, is divided up between five envelopes so that there are two cards in each envelope. The sum of the two numbers inside it is written on each envelope:

five envelopes with the numbers 7, 8, 13, 14 and 3 written on them (one number per envelope)

What numbers could be inside the "8" envelope?

Thank you to Alan Parr for allowing us to adapt one of his problems.