The essential arithmetricks, Kjartan Postkitt

Murderous math, The essential arithmetricks by Kjartan Postkitt

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Find out how to count your way out of a death-trap, why multiplication can stop a hairy green spot epidemic, and meet the barmy pure mathematicians who spent years proving 5 + 0 = 5. Meanwhile, Chainsaw Charlie, Halfsmile and their gang discover that even the simplest maths can be murderous.