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Show MAGIC MULTIPLICATION A Simple Way To Get Results In Figures It will Interest all who study short cuts and contrivances, to know that a novlco In arithmetic who has mastered mas-tered simple- addition and can multiply multi-ply or divide by 2, but no higher 'numbers, can by using all these methods me-thods multiply any two numbers easily and accurately. This is how It Is dono: Write down tho numbers, say, C3 and 21, dlvido ono of them by 2 as often as possible, ommlttlng remainders, remain-ders, and multiply tho other by 2 the sam0 number of times. Sot these down sldo by sido, as In Uio Instance-given Instance-given below, and whorevcr thero Is nn even number on tho division side strlko out tho corresponding number on tho multiplication sldo. Add up what remains on that sldo and the sum Is dono. Thus: C3 r 20 13 f 84 C . (1G8) 3 330 1 i..2 1113 which Is 53 multiplied by 21 |