39 59,319.,000. Tack on two 0s to arrive at 98,400. Set B numbers total. As fast as you can, what is 77 11? pencil-AND-paper multiplication For pencil-and-paper multiplication I use the superfly crypto monnaie criss-cross method, which enables me to write down the entire answer on one line without ever writing any partial results! One of the best books. When I finally ran across this method a few years later in a book by Martin Benj_ _4p_c03_r1.r.qxd 5/4/06 1:44 PM Page 54 54 Secrets of Mental Math Gardner on recreational math, Mathematical Carnival (1965 it ruined my day!
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As a teenager, I performed as a magician, and subsequently combined my loves of math and magic into a full-length show, called Mathemagics, where I would demonstrate and explain the secrets of rapid mental calculation to audiences of all ages. In that case, since you have only two hands, you will have to say the thousands digit of the answer out loud and use the rule of thumb to remember the rest of the answer. Or you can divide the original amount directly by 4, or cut in half twice: half of 42 is 21, and half of that.50. 223 Benj_ _4p_c10_r1.r.qxd 5/4/06 1:38 PM Page 224 224 Secrets of Mental Math There is an additional psychological factor at work here called the confirmation bias, where we notice the hits and ignore the misses in support of our favorite beliefs. The guesstimation methods described in this chapter will make both these tasksand many more just like themmuch easier. Unlike Colburn, who retired as a lightning calculator at age twenty, Bidder kept it up for his entire je cherche un travail sur le net life. It is the same everywhere Art Benjamin goes, whether it is a high school auditorium, a college classroom, a professional conference, the Magic Castle, or a television studio. But the most important component in this problem is where to place the. The difficult part comes in holding the preliminary answer in your head while computing the final answer.