Circular slide rule/ an early calculator

Contributed by St Lukes - Sway

Circular slide rule/ an early calculator

This is an early form of calculator. It is used by sliding one of the layers and then reading the corresponding answer on another part of the dial. This object was chosen by the children because it shows how calculators have changed. Children now have to learn their times tables off by heart but can use modern solar powered calculators to help. This object shows that children and adults in the past would still have been able to use an extra object to help them with their maths.

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