# How to simplify # (7.1times10^-7)(8.6times10^-5)# in scientific notation?

##### 1 Answer

Jan 25, 2016

#### Answer:

You **multiply** the numbers and **add** the 10-powers.

#### Explanation:

But we need to have only one digit in front of the decimal point:

And, since the original numbers had only two significant digits, we will round this to

**Comment** : I've placed brackets where they weren't technically necessary, but they may have added to the understanding of the steps we've taken.