What is the trick to know the square of number ending with 5?
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2
let the no. be A5
so square Will be
A(A+1) | 25
if A = 2
then 2*3| 25
= 6|25 = 625
so square Will be
A(A+1) | 25
if A = 2
then 2*3| 25
= 6|25 = 625
Anonymous:
ur wlcm altaf
Answered by
1
Hey there!
Let a5 be the number ending with 5 .
(a5)² = [a(a+1)] 25
Suppose,
25² = 2*3(25) = 625 .
We find the product of the digits with its successor and add 25 at the end to obtain it's square.
This process is handy for any number ending with 5 , But as you reach 1000's ,It will be real hard to find the product.
Let a5 be the number ending with 5 .
(a5)² = [a(a+1)] 25
Suppose,
25² = 2*3(25) = 625 .
We find the product of the digits with its successor and add 25 at the end to obtain it's square.
This process is handy for any number ending with 5 , But as you reach 1000's ,It will be real hard to find the product.
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