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Published on 11 Feb 2013 | over 3 years ago

Math trick to fast multiply any number with 5, 25, 125, and 15.

I am getting a lot of questions about applying this trick on odd numbers. Here is my answer.

I used even numbers to make it easy to understand. Now lets see. multiply by 5------67 x 5 = 335 (half of 67 is 33.5) Again, 67 x 25 = 1675 (1/2 of of 33.5 = 16.75) 67 x 125 = 8375 (1/2 of 16.75 = 8.375) Now it is possible that you may find it very difficult but you can do good approximation like this by choosing closer even number. 5 x 66 = 330 which is close to 335. this way you can get an idea. For exact calculation 25 x 55 = 1650 and 25 x 68 = 1700 average is 1675 www.garguniversity.com

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