I Used to Know That: Maths
I Used to Know That: Maths - Paperback is backordered and will ship as soon as it is back in stock.
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I Used to Know That: Maths
I Used to Know That: Maths - Paperback is backordered and will ship as soon as it is back in stock.
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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.
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