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

Jun 24, 2016

$720000 = 7.2 \times {10}^{5}$

#### Explanation:

The $\textcolor{red}{5}$ in ${10}^{\textcolor{red}{5}}$ is the number of significant digits that are in 7.20000, but 4 zeros are insignificant. Move the decimal $\textcolor{red}{5}$ places to the right to make 720000 which is the sum of $7.20000 \times {10}^{5}$

Another way to answer is knowing ${10}^{5} = 100000$

$7.2 \times 100000 = 720000$

${10}^{x}$ 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 $720000$