You have problem which looks like this
\(6 \frac{2}{3} * 3\frac{3}{10}\)
To multiply fraction we have to transform into improper fractions
\(\frac{20}{3}* \frac{33}{10}\)
We can reduce 3 and 33 by cross reducing and 10 and 20
\(\frac{2}{1} * \frac{11}{1} =2*11=22\) - its the result.