Another Easy math multiply method.
If the last digit of all the numbers is 5, there is a interesting methods for their class
Multiply the previous number by its next high number and finally sit 25.
Such as 35 x 35 = [3 x (3 + 1)] 25 = (3x4) 25 = 1225
75 x 75 = [7 x (7 + 1)] 25 = (7x 8) 25 = 5625
105 X 105 = [10 X (10 + 1)] 25 = (10x11) 25 = 1105
The above strategy is not just for those who has 5 at the end of the numbers. In fact, the sum of the last two digits is equal to the sum of 10 and the same number of units, they can be classified in the same way, for example-
78 X 72 (the last thing here, 8 + 2 = 10)
So the first part of the multiplication will be 7 x (7 + 1) = 7x8 = 56,
The second part will be, 8 x 2 = 16 (the result of the last two digit)
Multiplication 78x72 = 5616
Similarly, 63 x 67 = [6x (6 + 1)] [3x7] = 4222
This post is for those who did not know about.
Thanks to all.
Upvote, Resteem and keep following for more updates
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