how to solve five digit Square in less time
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Now we will go to the Topic How to square a number easily
Similer topic how-to-cube-number-in-just-5secs
First we are starting this topic we just learn three basic formula's for this topic
- (A+B)^2 =(A^2)+(B^2)+(2*A*B)
- (A+B)^2 =(A^2)+(B^2)-(2*A*B)
- (A^2)-(B^2) =(A+B)(A-B)
Now we will practice some problems on this
Based on Formala -1
Ex:- (102)^2=?
Ans) According to Formula we will devide 102 into 100+2
(102)^2 = (100+2)^2
= (100)^2+(2)^2+(2*100*2)
= 10000+4+400
(102)^2 = 10404
Like that we can solve 5-disit number also
Based on Formala -2
Ex:- (98)^2=?
Ans) According to Formula we will devide 98 into 100-2
(98)^2 = (100-2)^2
= (100)^2+(2)^2-(2*100*2)
= 10000+4-400
(98)^2 = 9604
Like that we can solve 5-disit number also
Based on Formala -3
Ex:- (95)^2-(5)^2=?
Ans) According to Formula we will write it as (95)^2-(5)^2 = (95+5)(95-5)
(95)^2-(5)^2 = (95+5)(95-5)
= 100*90
= 9000
