Question

how to calculate square of any no . very fast?​

Answer 1

Just break it in two numbers

For example-

42

(40+2)

40(40+2)+2(40+2)

1600+80+80+4

1764

MARK IT BRAINLIEST IF YOU FIND IT HELPFUL

Answer 2

First add the last digit (2) to the number itself: 32 + 2 = 34. Multiply the sum by the first digit: 34 × 3 = 102. Square the last digit: 2² = 4. Append that square to the product just computed: 1024.

or multiply that number with that one.