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

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 sketch graphs to show how the height of water changes in different containers as they are filled?

What shape would fit your pens and pencils best? How can you make it?

Examine these estimates. Do they sound about right?

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

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

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

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

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...

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

How would you go about estimating populations of dolphins?

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

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

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

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. . . .

Can you deduce which Olympic athletics events are represented by the graphs?

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.

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

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

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

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

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

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

Get some practice using big and small numbers in chemistry.

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

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

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

Can you draw the height-time chart as this complicated vessel fills with water?

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

Work out the numerical values for these physical quantities.

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

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

Explore the relationship between resistance and temperature

Can Jo make a gym bag for her trainers from the piece of fabric she has?

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?

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