Correct. Regroup the factors: $\displaystyle{\left({2}\times{4}\right)}{\left({{10}}^{{3}}\times{{10}}^{{5}}\right)}\usepackage{cmbright}\Huge\$

Multiply the numbers: $\displaystyle{\left({8}\right)}{\left({{10}}^{{3}}\times{{10}}^{{5}}\right)}\usepackage{cmbright}\Huge\$

Multiply the powers of 10, adding the exponents: $\displaystyle{8}\times{{10}}^{{8}}\usepackage{cmbright}\Huge\$