Question

Recently in the United States, there were about 300,000,000 cell phone users. That same year there were about 5.7x10^9 cell phone users worldwide. About how many times larger was the number of cell phone users world wide than in the United States?
Please provide steps.

Answer 1

US:  3 x 10^8
5.7 x 10^9  /  3 x 10^8 = 19

Answer 2

$\frac{users worldwide}{US users}$
$\frac{5700000000}{300000000}$
$19$