Decimals

problem
Favourite

Tiny Nines

Age

14 to 16

Challenge level

What do you notice about these families of recurring decimals?
problem
Favourite

Repetitiously

Age

14 to 16

Challenge level

Can you express every recurring decimal as a fraction?
problem

Decimal Time

Age

11 to 14

Challenge level

Use the clocks to investigate French decimal time in this problem. Can you see how this time system worked?
problem

Recurring Mean

Age

14 to 16

Challenge level

What is the mean of 1.2 recurring and 2.1 recurring?
problem

Reductant Ratios

Age

16 to 18

Challenge level

What does the empirical formula of this mixture of iron oxides tell you about its consituents?
problem

Magic Matrix

Age

7 to 11

Challenge level

Find out why these matrices are magic. Can you work out how they were made? Can you make your own Magic Matrix?
problem

Toad in the Hole

Age

11 to 14

Challenge level

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?
problem

A Long Time at the Till

Age

14 to 18

Challenge level

Try to solve this very difficult problem and then study our two suggested solutions. How would you use your knowledge to try to solve variants on the original problem?