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.
I have a question about the book:
'I Used to Know That: Maths - Waring, Chris'.
Fill in the form below.
We will respond as fast as possible.
We value your privacy
We use cookies to measure traffic, improve Boekstra and let Google tailor ads to your interests. You can keep using the site either way — even if you decline. More info
