955^2 ==> (1000-45)^2 ==> 1000000 + 45^2 - 90000 ==> 910000 + 45^2. So, the answer should be just above 910000. The only answer closest is B.
Note: We don't need to find the square of 45^2.
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Nice try Vemuri but risky. Here is a trick for squaring numbers that end in 5.Vemuri wrote:955^2 ==> (1000-45)^2 ==> 1000000 + 45^2 - 90000 ==> 910000 + 45^2. So, the answer should be just above 910000. The only answer closest is B.
Note: We don't need to find the square of 45^2.
If 2 digits, such as 15^2 multiply the tenth digit and 1+tenth digit and add 25 to the end.
(1) (2) =2 just add 25 to end 225. If more than 2 digits treat rest of digits as tenth and do the same trick.
So 95 96 and add 25 to end of product. But
95 ( 95+1)
95^2 +95 ( you have another sqare invoing 5 at end)
9 x 10= 90 add 25 to end 9025 +95=9120 don't forget to add the 25 from original problem
912025.
So Never waste time on traditionally muliplying any square that ends in 5
Numbers like 45^2 75^2 85^2 may kill some time on GMAT when solving problems plus a liitle error and you are done.
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dumb.doofus
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true.. its vedic mathematics.. quite simple stuff.. thanks for sharing..
https://www.vedicmaths.org/Introduction/ ... #tutorial5
https://www.vedicmaths.org/Introduction/ ... #tutorial5
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That is an awesome link! Thanks!dumb.doofus wrote:true.. its vedic mathematics.. quite simple stuff.. thanks for sharing..
https://www.vedicmaths.org/Introduction/ ... #tutorial5
