Do ten mental maths problems

Work out sums in your head without a calculator.

Why it helps

Mental arithmetic keeps number sense sharp and helps with budgeting, shopping and estimates.

How to do it

1. Think of ten sums such as 47 plus 38 or 15 percent of 60.
2. Solve each in your head.
3. Check with a calculator and note any pattern in errors.

Make it easier

Do five easy sums.

Make it harder

Use multiplication and percentages with a time limit.