The I Used To Know That: Maths Activity Book: Stuff You Forgot From SchoolArithmetic, Probability, Fractions, Measurements maths is one of those subjects that continue to throw a lot of us in a muddle long after our school days. Yet we still need to use it every day, from splitting the bill in a restaurant, to counting out change at a till or working out exchange rates. 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