Question

How to find the square of a number without actual multiplication?

Answer 1

Answer:

use this method then

like I take the example :sq of 89

U have studied in your factorization chapter

like:

(a+b) sq = a sq+b sq +2ab

so split 89

80+9

80 sq + 9 sq +2*80*9

6400+81+1440

add this

ans. 7881