Question

What is `7.2times10^5` in a standard notation?

Answer 1

`720000 = 7.2xx10^5`

Explanation:

The `color(red)5` in `10^color(red)5` is the number of significant digits that are in 7.20000, but 4 zeros are insignificant. Move the decimal `color(red)5` places to the right to make 720000 which is the sum of `7.20000xx10^5`

Another way to answer is knowing `10^5=100000`

`7.2xx100000=720000`

`10^x` means `x` is the number of zeros to the right of `1`

when finding the standard notation of scientific notation the first number to the right counts as one of the zeros, 2 in `7.2` is one of the zeros in `10^5`, add 4 more zeros to the right of 2 and remove the decimal to make `720000`