Math Techniques

Find square of 43
=(43+3)*(43-3)+(3*3)
=(46)*(40)+(9)
=(1840)+(9)
=1849

Find square of 69
=(69-1)*(69+1)+(1*1)
=(68)*(70)+(1)
=4761

Square roots √1936 
=√ 4*√ 484
=√ 4*√ 4*√ 121
=2*2*11
=44

Multiplication 99*5
=990/2
=495