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There are 3 NRICH Mathematical resources connected to Mass and weight, you may find related items under Measuring and calculating with units.
Broad Topics > Measuring and calculating with units > Mass and weightCan you rank these sets of quantities in order, from smallest to largest? Can you provide convincing evidence for your rankings?
My measurements have got all jumbled up! Swap them around and see if you can find a combination where every measurement is valid.
This article for teachers suggests ideas for activities built around 10 and 2010.