Radio 4 in Four - Tips to help you impress people doing hard maths in your head - ÃÛÑ¿´«Ã½ Sounds

Radio 4 in Four - Tips to help you impress people doing hard maths in your head - ÃÛÑ¿´«Ã½ Sounds
Tips to help you impress people doing hard maths in your head
How to manage big or complicated numbers when you are stuck without a calculator.