First, multiply the numbers and ignore the decimal points. Just pretend the decimal points are not there.
18.65
x 6.8
-----------
14920
+ 11190
------------
126820
Now you need to place the decimal point.
The original numbers are 18.65 and 6.8.
18.65 has 2 decimal places to the right of the decimal point.
6.8 has 1 decimal place to the right of the decimal point.
Add the number of decimal places to the right of the decimal point of both numbers: 2 + 1 = 3.
The answer, 126820, must also have 3 decimal places to the right of the decimal point, so we count digits starting at the right side (with the 0, and we place the decimal point after the third digit (to the left of the third digit).
126.820
Since a final zero after the decimal point has no value, we simply write 126.82
Answer: 126.82
