Converting between units

There are 12 NRICH Mathematical resources connected to Converting between units
At the pumps
problem

At the pumps

Age
7 to 11
Challenge level
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How will you find out how much a tank of petrol costs?
Weighing fruit
problem

Weighing fruit

Age
7 to 11
Challenge level
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Can you use this information to estimate how much the different fruit selections weigh in kilos and pounds?