how do you write 8.678 × 10^{-10} in standard form?

$how do you write 8.678 × 10^{-10} in standard form?$

When we have a number in scientific - notation $a\times10^{-n}$ ($n>0$), we move the decimal point $n$ places to the left.

For $8.678\times 10^{-10}$, we move the decimal point 10 places to the left. We add 9 zeros before 8. So the number is $0.0000000008678$.

$0.0000000008678$