The I Used to Know That: Maths Activity Book is a guide designed to take the fear out of maths. Guiding you through the all basics and beyond, this book is full of clear and simple explanations with enjoyable exercises to help square your knowledge.
Daniel Smith is a non-fiction author and editor who has written across a range of subjects, including politics, economics and social history. He is the author of the 'How to Think Like ...' series for Michael O'Mara Books, which has been published in 20 languages and sold over 413,000 copies worldwide. He is also a long-time contributor to The Statesman's Yearbook, the geo-political guide to the world that celebrated its 150th anniversary in 2013. He lives in London.