50 Math Tricks That Will Change Your Life HPL110224 and lumber to build roads

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50 Math Tricks That Will Change Your Life HPL110224 and lumber to build roadsLearn outrageous secrets for solving math questions without a calculator! Change the way you look at math forever, with these insane tricks that make working with numbers fun and exciting for all ages! This incredible collection will teach you how to do equations in a flash (no calculator required!) to help with everyday questions and situationsfrom figuring out how many hours you spent at school last year, to who pays what at a restaurant. Impress