Answer
28.56
Work Step by Step
Since the first factor has 1 decimal place and the second has 1 decimal place, the product has 2 decimal places.
$\ \ \ \ \ 6.8$
$\underline{\times\ \ 4.2}$
$\ \ \ \,1.36$
$\underline{\ \ 27.20}$
$\ \ 28.56$
Estimate:
$6.8\approx7$
$4.2\approx4$
$7\times4=28\checkmark$
