How many legs do each of these creatures have? How many pairs is that?

This activity challenges you to decide on the 'best' number to use in each statement. You may need to do some estimating, some calculating and some research.

Can you put these times on the clocks in order? You might like to arrange them in a circle.

Can you place these quantities in order from smallest to largest?

Can you order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?

Can you rank these quantities in order? You may need to find out extra information or perform some experiments to justify your rankings.

Can you put these mixed-up times in order? You could arrange them in a circle.

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

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

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?

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

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?

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

A weekly challenge concerning the decay of medicines in the body.

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

Have you got the Mach knack? Discover the mathematics behind exceeding the sound barrier.

Can you sketch these difficult curves, which have uses in mathematical modelling?

How does the half-life of a drug affect the build up of medication in the body over time?

Thomas from Colet Court and pupils from Kingsbury Green Primary worked particularly thoughtfully on this problem.

Lots of you sent clear explanations of how to solve any multiplication arithmagon.

We received some different methods for tackling this really hard arithmagon with surds.

This article for teachers recounts the history of measurement, encouraging it to be used as a spring board for cross-curricular activity.

STEM students at university often encounter mathematical difficulties. This articles highlights the various content problems and the 7 key process problems encountered by STEM students.

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

There has been a murder on the Stevenson estate. Use your analytical chemistry skills to assess the crime scene and identify the cause of death...