Question

How do you write `0.721` in scientific notation?

Answer 1

`0.721 =7.21xx10^-1`

Explanation:

In scientific notation, there must be only 1 digit in front of the decimal point. The size of the number is given as a power of 10

`0.721 =7.21xx10^-1`

Consider the following:

`0.721 = 721/1000 = 72.1/100 = 7.21/10`

Using laws of indices, we can write

`7.21/10 =7.21 xx 10^(-1)`