In this twist on the well-known Countdown numbers game, use your knowledge of Powers and Roots to make a target.

How might you use mathematics to improve your chances of guessing the number of sweets in a jar?

Examine these estimates. Do they sound about right?

Get some practice using big and small numbers in chemistry.

Work out the numerical values for these physical quantities.

How many generations would link an evolutionist to a very distant ancestor?

Estimate these curious quantities sufficiently accurately that you can rank them in order of size

Sissa cleverly asked the King for a reward that sounded quite modest but turned out to be rather large...

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

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

10 graphs of experimental data are given. Can you use a spreadsheet to find algebraic graphs which match them closely, and thus discover the formulae most likely to govern the underlying processes?

Can you work out how many of each kind of pencil this student bought?

Practise your skills of proportional reasoning with this interactive haemocytometer.

Here is a chance to play a version of the classic Countdown Game.

Bluey-green, white and transparent squares with a few odd bits of shapes around the perimeter. But, how many squares are there of each type in the complete circle? Study the picture and make. . . .

There are nasty versions of this dice game but we'll start with the nice ones...

Who said that adding, subtracting, multiplying and dividing couldn't be fun?