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# Arrow Arithmetic 1

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Age 14 to 16

Challenge Level

- Problem
- Getting Started
- Student Solutions
- Teachers' Resources

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.

Is the length important?

Is the direction important?

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

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.

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?