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Squaring numbers ending in 5..

Subhankar
15/12/2016 0 0

Solve the square of 25, in a jiffy.   Answer : 625

Another one: square of 35. Answer : 1225.

How it is done ?
25 x 25 . The last two digits of the product will always be 25 ( as 5 x 5 =25). The initial digits are obtained by multiplying 2  x 3 [ i.e. n (n+1) ].
Try it and see if you can square these numbers in a couple of seconds.
65, 75, 95.....

 

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