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Napier's Bones

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

The Scot, John Napier, invented these strips (originally made from bone) about 400 years ago to help calculate multiplication and division.

This is what they looked like:

Diagram of Napier's bones.

Can you work out how to use Napier's bones to find the answer to 24 x 6?
How about 461 x 4?
Now try 8931 x 6.

Can you work out how you would use them to calculate the product of 3541 and 768?