Mathemagics: How to Look Like a Genius Without Really Trying
MATHEMAGICS shows you how to add, subtract, multiply, and divide faster in your head than with a calculator, let alone using pencil and paper. Imagine knowing the cash register total at the supermarket before the clerk rings it up, or the exact tip at a restaurant without appearing to think about it. With MATHEMAGICS these tricks are so easy to learn that they make calculating actually enjoyable.
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2-by-1 problem 2-by-2 multiplication problems 2-digit number 3-digit square add back adding addition method addition problem arithmetic arrive Arthur Benjamin audience bers Bidder break carry numbers casting out nines chapter check your answer Colburn columns of numbers complement criss-cross method cube root decimal point divide divisible by 11 division problems easier easy exact answer example factoring method figure final answer fingers following numbers following problem fraction give Here's illustrated larger number last digit last two digits learned left to right lems lightning calculator look Magic Castle magic square math mathemagician mathematics memory mental calculation Michael Shermer million mnemonics multiple of 9 number is divisible number of digits numbers end original number pencil-and-paper phonetic code practice prob quotient remainder remember round rule of thumb second number Shakuntala Devi simplify the problem skills solve sound square root subtraction method techniques Thomas Fuller thousand volunteer words Zerah Colburn