Converting between units

problem
Uniform units

Age

14 to 16

Challenge level

Can you choose your units so that a cube has the same numerical value for it volume, surface area and total edge length?
problem
At the pumps

Age

7 to 11

Challenge level

How will you find out how much a tank of petrol costs?
problem
Weighing fruit

Age

7 to 11

Challenge level

Can you use this information to estimate how much the different fruit selections weigh in kilos and pounds?
problem
Olympic measures

Age

11 to 14

Challenge level

These Olympic quantities have been jumbled up! Can you put them back together again?
problem
All in a jumble

Age

11 to 14

Challenge level

My measurements have got all jumbled up! Swap them around and see if you can find a combination where every measurement is valid.
problem
Thousands and millions

Age

11 to 14

Challenge level

Here's a chance to work with large numbers...
problem
Bigger or smaller?

Age

14 to 16

Challenge level

When you change the units, do the numbers get bigger or smaller?
problem
Choose your units

Age

14 to 16

Challenge level

Which units would you choose best to fit these situations?
problem
Carbon footprints

Age

14 to 16

Challenge level

Is it really greener to go on the bus, or to buy local?
problem
Nutrition and cycling

Age

14 to 16

Challenge level

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