You may also like

Prompt Cards

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

Consecutive Numbers

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

Exploring Wild & Wonderful Number Patterns

EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.

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