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Imagine different shaped vessels being filled. Can you work out what the graphs of the water level should look like?

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

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

Our making caterpillars activity uses clay and dough to introduce measurement. DOWNLOAD HERE

This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.

By exploring the concept of scale invariance, find the probability that a random piece of real data begins with a 1.

How does Snow White need to change her result after the mix-up?

Analyse these beautiful biological images and attempt to rank them in size order.

This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.

Many physical constants are only known to a certain accuracy. Explore the numerical error bounds in the mass of water and its constituents.

Which units would you choose best to fit these situations?

Work with numbers big and small to estimate and calulate various quantities in biological contexts.

Can you suggest a curve to fit some experimental data? Can you work out where the data might have come from?

The Earth is further from the Sun than Venus, but how much further? Twice as far? Ten times?

What if the Earth's shape was a cube or a cone or a pyramid or a saddle ... See some curious worlds here.