# How do you calculate (9.1times10^7) div (4.5times10^8)?

Aug 30, 2016

#2.022 xx 10^-1

#### Explanation:

Write is as a fraction - it makes the index part easier to follow.

$\frac{9.1 \times {10}^{7}}{4.5 \times {10}^{8}}$

=$2.022 \times {10}^{-} 1$

Divide the numbers and subtract the indices of 10.

We are dividing a small number by a bigger number, so the negative index in the answer is as we expect.