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'Watching the Wheels Go 'round and 'round' printed from https://nrich.maths.org/
You may find it helpful to find a toy with wheels or a wheel from a
construction set, then to mark a point on the wheel and watch it
turning. You could compare this with a differently sized
wheel.
How many centimetres are there in a metre ... in two metres?
How many metres are there in a kilometre?
Which wheel will turn the most during the
journey?