Question

How do you work out `(3.2times10^5)times(4.5times10^4)`?

Answer 1

You multiply the numbers and add the 10-powers

Explanation:

`=(3.2xx4.5)xx(10^5xx10^4)`
`=14.4xx10^(5+4)=14.4xx10^9`

Since we want only one non-zero digit in front of the decimal point:
`=1.44xx10xx10^9=1.44xx10^10`