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A Story about Absolutely Nothing

This article for the young and old talks about the origins of our number system and the important role zero has to play in it.

Balance Power

Using balancing scales what is the least number of weights needed to weigh all integer masses from 1 to 1000? Placing some of the weights in the same pan as the object how many are needed?

Galley Division

Can you explain how Galley Division works?

Arrow Arithmetic 1

Age 14 to 16
Challenge Level
Think about what features of the arrow are representing the number 1.

Is the length important?

Is the direction important?

Sam, Hannah and Tim might have different ideas on what features mattered.