Here is a step by step walk through on how to multiply decimals.

Step 1.  Ignore the decimals and multiply starting from your right side.

Step 2.  After each column you multiply add a zero in the appropriate spot.

Step 3.  When you have added up all the numbers put the decimal over to the left of the numbers in your answer as many times as the decimal was over as many spaces to the left in the above numbers.