Practise

Worked problems

Watch one solved a step at a time, then solve the next.

Solve one alongside a worked example, then one on your own.

Discounting · WalkthroughWorked problem

You’re offered £110 in a year or £100 today. At an interest rate of 5%, which is worth more today?

Try it yourself

The real thing, not a picture of it. Try it.

Try it first

When the answer is short, type yours before you look. Getting it right shows you’re ready to move on.

The solution opens a move at a time, each saying what to do and why, so you can stop when you see the way.

A similar problem follows without the steps, so you know you can do it, not just follow it.