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Awesome Arithmetricks: How to + - X (Murderous Maths)
Awesome Arithmetricks How to X - Murderous Maths Author:Kjartan Poskitt Maths with the laughs added in! ? Why nothing sometimes means something? ? Can you beat Professor Fiendish's foul formula? ? What can stop a hairy green spot epidemic? Find out in the Essential Arithmetricks - all the tricks, tips and short-cuts they don't teach at school.