When you change the units, do the numbers get bigger or smaller?
Which units would you choose best to fit these situations?
In which Olympic event does a human travel fastest? Decide which events to include in your Alternative Record Book.
Is it really greener to go on the bus, or to buy local?
Practice your skills of measurement and estimation using this interactive measurement tool based around fascinating images from biology.
Andy wants to cycle from Land's End to John o'Groats. Will he be able to eat enough to keep him going?
Can you choose your units so that a cube has the same numerical value for it volume, surface area and total edge length?