Invent a scoring system for a 'guess the weight' competition.

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

Make your own pinhole camera for safe observation of the sun, and find out how it works.

Work out the numerical values for these physical quantities.

Examine these estimates. Do they sound about right?

Make an accurate diagram of the solar system and explore the concept of a grand conjunction.

Which dilutions can you make using only 10ml pipettes?

Where should runners start the 200m race so that they have all run the same distance by the finish?

Two trains set off at the same time from each end of a single straight railway line. A very fast bee starts off in front of the first train and flies continuously back and forth between the. . . .

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

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?

Get some practice using big and small numbers in chemistry.

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

Use trigonometry to determine whether solar eclipses on earth can be perfect.

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

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

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

Explore the relationship between resistance and temperature

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

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

How would you go about estimating populations of dolphins?

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

If I don't have the size of cake tin specified in my recipe, will the size I do have be OK?

In Fill Me Up we invited you to sketch graphs as vessels are filled with water. Can you work out the equations of the graphs?

Formulate and investigate a simple mathematical model for the design of a table mat.

An observer is on top of a lighthouse. How far from the foot of the lighthouse is the horizon that the observer can see?

Can you work out which processes are represented by the graphs?

What shapes should Elly cut out to make a witch's hat? How can she make a taller hat?

How would you design the tiering of seats in a stadium so that all spectators have a good view?

Is it cheaper to cook a meal from scratch or to buy a ready meal? What difference does the number of people you're cooking for make?

Can you visualise whether these nets fold up into 3D shapes? Watch the videos each time to see if you were correct.

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

The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories?

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

Water freezes at 0°Celsius (32°Fahrenheit) and boils at 100°C (212°Fahrenheit). Is there a temperature at which Celsius and Fahrenheit readings are the same?

Various solids are lowered into a beaker of water. How does the water level rise in each case?

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

Which countries have the most naturally athletic populations?

Starting with two basic vector steps, which destinations can you reach on a vector walk?

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

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