Practise your skills of proportional reasoning with this interactive haemocytometer.

Examine these estimates. Do they sound about right?

Which dilutions can you make using only 10ml pipettes?

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?

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

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.

Can you work out the parentage of the ancient hero Gilgamesh?

Which units would you choose best to fit these situations?

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

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

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

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

bioNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of the biological sciences, designed to help develop the mathematics required to get the most from your. . . .

In which Olympic event does a human travel fastest? Decide which events to include in your Alternative Record Book.

This problem explores the biology behind Rudolph's glowing red nose.

Practice your skills of measurement and estimation using this interactive measurement tool based around fascinating images from biology.

Maths is everywhere in the world! Take a look at these images. What mathematics can you see?

How would you go about estimating populations of dolphins?

Could nanotechnology be used to see if an artery is blocked? Or is this just science fiction?

To investigate the relationship between the distance the ruler drops and the time taken, we need to do some mathematical modelling...

Create a symmetrical fabric design based on a flower motif - and realise it in Logo.

Build a mini eco-system, and collect and interpret data on how well the plants grow under different conditions.

Simple models which help us to investigate how epidemics grow and die out.

What is the chance I will have a son who looks like me?

Do you know which birds are regular visitors where you live?

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