Question

How many times smaller is 3 × 10^-8 than 6 × 10^-3?

A.20,000,000

B.2,000,000

C.200,000

D.20,000

Answer 1

$\frac{6 \times 10^{-3}}{3 \times 10^{-8}}=\frac{6}{3} \times \frac{10^{-3}}{10^{-8}}=2 \times 10^{-3-(-8)}=2 \times 10^{-3+8}=2 \times 10^5= \\ \\ =2 00 ,000$

The answer is C.