scientific notation

Question

4.0x10^-3x3.6x10^-3/1x10^4x4.5x10^-2

Answer 1

(4.0x10^-3)*(3.6x10^-3)/[(1x10^4)*(4.5x10^-2)]
= [(4.0)*(3.6)]/4.5]* 10^(-3-3-4+2)
= 3.2 * 10^-8