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

Examine these estimates. Do they sound about right?

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

Use your skill and knowledge to place various scientific lengths in order of size. Can you judge the length of objects with sizes ranging from 1 Angstrom to 1 million km with no wrong attempts?

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

Have you ever wondered what it would be like to race against Usain Bolt?

Work out the numerical values for these physical quantities.

Get some practice using big and small numbers in chemistry.

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

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

These Olympic quantities have been jumbled up! Can you put them back together again?

From the information you are asked to work out where the picture was taken. Is there too much information? How accurate can your answer be?

How many teddies are in the jar? How many teddies could you fit in your classroom?

Can you rank these sets of quantities in order, from smallest to largest? Can you provide convincing evidence for your rankings?

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

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?

Andy is desperate to reach John o'Groats first. Can you devise a winning race plan?

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. . . .

Choose some fractions and add them together. Can you get close to 1?

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

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

A 1 metre cube has one face on the ground and one face against a wall. A 4 metre ladder leans against the wall and just touches the cube. How high is the top of the ladder above the ground?

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

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

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

How many ways can you find to put in operation signs (+ - x รท) to make 100?

Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.