When you multiply decimals, you more or less forget about the decimal point until the last step. A difference between multiplying numbers with decimals and multiplying numbers with whole numbers is that when you multiply numbers with decimals you put the number with the most digits on top rather than the largest number. In the example below, 7.3 is much larger but since 1.25 has three digits and 7.3 only two, you put 1.25 on top.
7.3 x 1.25 = ?
Now comes the part where you deal with the placement of the decimal point. The way you do this is by adding up the number of digits to the right of the decimal point in both of the original numbers, then count back from right to left on the number you came up with in the first step to find where you should place the decimal point.
7.3 x 1.25 = 9.125