Finding square of a number without multiplication
Square of a number without multiplication
We can easily solve the square of small numbers like 2, 3, 4, 5, 6, 7, 8, 9,….etc.
But how to solve greater numbers, like 23.
write 23 as 20 + 3
Therefore, 232 = (20 +3)2
= 20(20 + 3) + 3(20 + 3)
= 20 x 20 + 20 x 3 + 3 x 20 + 3 x 3
= 400 + 60 + 60 + 9
= 400 + 120 + 9
232 = 529
similarly we find the square of 32
write 32 as 30 + 2
Therefore, 322 = (30 +2)2
= 30(30 + 2) + 2(30 + 2)
= 30 x 30 + 30 x 2 + 2 x 30 + 2 x 2
= 900 + 60 + 60 + 4
= 900 + 120 + 4
322 = 1024
similarly we find the square of 49
write 49 as 40 + 9
Therefore, 492 = (40 +9)2
= 40(40 + 9) + 9(40 + 9)
= 40 x 40 + 40 x 9 + 9 x 40 + 9 x 9
= 1600 + 360 + 360 + 81
= 1600 + 720 + 81
492 = 2401
we find the square of 83
write 83 as 80 + 3
Therefore, 832 = (83 +3)2
= 80(80 + 3) + 3(80 + 3)
= 80 x 80 + 80 x 3 + 3 x 80 + 3 x 3
= 6400 + 240 + 240 + 9
= 6400 + 480 + 9
832 = 6889