Chris Waring Libri

An Equation for Every Occasion tackles some frankly ridiculous scenarios with essential bullet-proof equations that you'll probably never be able to apply in real life.

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.

A humorous guide to the hidden calculations that are essential to everything we do.