Download Mathemagics: How to Look Like a Genius Without Really Trying by Arthur Benjamin, Michael Brant Shermer PDF

By Arthur Benjamin, Michael Brant Shermer

Utilizing confirmed ideas, this quantity exhibits tips to upload, subtract, multiply and divide quicker than is feasible with a calculator or pencil and paper, and is helping readers overcome their anxiousness approximately math.

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Since you do not need PRODUCTS OF A MISSPENT YOUTH: BASIC MULTIPLICATION 23 to carry any numbers, it is easy to add 42 to 2240 to arrive at the total of 2282. In solving this and other 3-by-l multiplication problems, the difficult part may be holding in memory the first sum (in this case, 2240) while doing the next multiplication problem (in this case, 6 x 7). There is no magic secret to remembering that first number, but with practice I guarantee you will improve your concentration so that holding on to numbers while performing other functions will get easier.

Here is another example of rounding up: 54 28 (30 - 2) -- Since this problem requires you to borrow, round up 28 to 30, subtract, and then add back 2 to get 26 as your final answer: 54 -30 - 28 ----i 24 + 2 +2 -i =26 Now try your hand at this 2-digit subtraction problem: 81 - 37 Easy, right? You just round up 37 to 40, subtract 40 from 81, which gives you 41, and then add back the difference of 3 to arrive at 44, the final answer: 81 - 40 - 37 ----i 41 + 3 + 3 -i = 44 A LIITLE GIVE AND TAKE: MENTAL ADDITION AND SUBTRACTION 11 In a short time you will become comfortable working subtraction problems both ways.

J~~ 1-1~~~~ Mathemagics really gets exciting when you perform in front of an audience. I experienced my first taste of public adulation in eighth grade, at the fairly advanced age of 12. Many mathemagicians begin even earlier. Zerah Colburn (1804-1839), for example, reportedly could do lightning calculations before he could read or write, and was entertaining audiences by the age of six! " The teacher did the calculation on the board and arrived at the same answer. Looking a bit startled, she said, "Yes, that's right.

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