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SHORT CUTS IN MATHEMATIC [1] Squaring numbers in the 50's: Example 56 x 56: Step 1: You start out with 25 and add the ones digit to it. 25 + 6 = 31 Step 2: Square the ones digit. 6 x 6 =36 Tack this onto the end of the answefrom step 1. Answer: 56 x 56 = 3,136 Now, if the number from step 2 is less than 10, you have to put a zero in fronit. So, if it is 53 x 53: Step 1: 25 + 3 = 28 Step 2: 3 x 3 = 09 (note that since 9 is smaller than 10 we have tu put a zerofront of it) Answer: 53 x 53 = 2,809 [2] Squaring numbers that end in 5: Example 65 x 65: Step 1: Take the tens digit and multiply it by the number one greater than it. 7 = 42 Step 2: Tack 25 onto the
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submitted by rakesh61 (1898 m) on 8 Aug 2007 19:39:50 IST (13 comments 480 views)
