\[m = a \cdot 10^{- 2};\ \ 0 < a < 10\]
\[n = b \cdot 10^{3};\ \ 0 < b < 10\]
\[mn = ab \cdot 10^{- 2} \cdot 10^{3} = ab \cdot 10^{1}\]
\[10^{1} < mn < 10^{2}\]
\[порядок\ числа\ 1\ или\ 2.\]