Maths trick
>What is the square of (15)² ?
Ans. 225
>What is the square of (65)² ?
Ans. 4225
How is going on?
Let's see!
Eg. (15)²
1×2|(5)²
2|25 = 225
2|25 = 225
Eg. (65)²
6×7|(5)²
42|25 = 4225
> see above table
42|25 = 4225
> see above table
Ten's place digit is multiply by its consecutive digit.
& Square of Unit digit (unit digit 5 is compulsory), combining both you
get Ans.
More Eg.
(85)²
8×9|(5)²
72| 25 = 7225
(125)²
12×13|(5)²
156|25 = 15625
(225)²
22×23|(5)²
506|25 = 50625
(995)²
99×100|(5)²
9900|25 = 990025
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