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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.
- Michael O' Mara Books, April 2012
Michael O' Mara Books
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