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Post on 13-Apr-2017
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Square of a number ends with 5.
Speed Maths by Mdfaisal.com
Friends! This technique will help you in calculating squares of those numbers which ends with 5.
Like 25, 35, 45, 65, 85, 105, 125, 225 etc.
Let’s take for example
(35)2
Step 1 – First do the square of 5, ie. 25.
Step 2 – Now, multiply the number which is at ten’s place by its next number. So, n x (n+1), i.e. 3 X 4 = 12.
Step 3 – So, our final answer become 1225.
2512
Similarly
(55)2
Step 1 – First do the square of 5, ie. 25.
Step 2 – Now, multiply the number which is at ten’s place by its next number. So, n x (n+1), i.e 5 X 6= 30.
Step 3 – So, our final answer become 3025.
2530
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