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These two group activities use mathematical reasoning - one is numerical, one geometric.

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Exploring Wild & Wonderful Number Patterns

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Zargon Glasses

Age 7 to 11 Challenge Level:

Zumf makes spectacles for the residents of the planet Zargon, who have either three eyes or four eyes. So Zumf makes glasses with three lenses and glasses with four lenses.

One day he took orders from nine families. Each family ordered eight glasses, but each order was different.

How many lenses will Zumf need to make all nine orders?

Zargon Glasses