Question

How do you simplify `\frac { 8.4\times 10^ { 2} } { 2.1\times 10^ { 5} }`?

Answer 1

You divide the numbers, and subtract the 10-powers:

Explanation:

`=8.4/2.1xx10^2/10^5=8.4/2.1xx10^(2-5)=4xx10^(-3)`