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# Uniform Units

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Age 14 to 16

Challenge Level

- Problem

I have a $1$m cube. Its volume is $1$m$^3$, its surface area $6$m$^2$ and its total edge length $12$m. If I measure the dimensions of the same cube in centimetres, then its volume would be $1000000$cm$^3$, its total surface area $60000$cm$^2$ and its total edge length $1200$cm.

In the first case, the total edge length is numerically largest, whereas in the second case the total volume is numerically largest.

Could you choose a unit of measurement so that the surface area was numerically largest?

Can you choose a unit of measurement so that two of the quantities are numerically the same?

Why can't you find a unit of measurement so that all three quantities are numerically the same?

Can you invent any shape for which you can choose units so that the total edge length, total surface area and volume are numerically equal?

In which Olympic event does a human travel fastest? Decide which events to include in your Alternative Record Book.

Andy wants to cycle from Land's End to John o'Groats. Will he be able to eat enough to keep him going?