The laws of exponents that are often used in calculating values written in scientific notation are
[tex]a^m*a^n = a^{m+n}[/tex], and
[tex] \frac{a^m}{a^n}= a^{m-n} [/tex]
for example;
[tex]10^6*10^{-7}=10^{(6+-7)}=10^{-1}[/tex]
[tex] \frac{10^{-8}}{10^{-9}}=10^{(-8--9)}=10^1 [/tex]