I Used to Know That: Maths
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15
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Average rating4
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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Featured Series
1 released bookI Used to Know That is a 5-book series first released in 2008 with contributions by Fred DuBose, Patrick Scrivenor, and 3 others.
