Brush up on your mental arithmetic, including percentages, averages and recurring decimals or work on your trigonometry skills, from Pythagoras Theorem to triangle areas and angles. I Used To Know That: Maths is a fun and accessible way to re-visit all those useful tips and maths tricks that you have forgotten from your school days.
- ISBN10 184317474X
- ISBN13 9781843174745
- Publish Date 27 May 2010
- Publish Status Active
- Out of Print 15 June 2021
- Publish Country GB
- Imprint Michael O'Mara Books Ltd
- Format Hardcover
- Pages 192
- Language English