Answer:

in multiplying a numbers with decimal points. it's just like multiplying a normal number then after multiplying it count the numbers of decimal places then from the right most side of the product-count the decimal points then point.

ex. 2.3×4.7

-just the same as

23×47=1081

so count the decimal points (2.3) one, (4.7) two.

then the product 1081 from the most right number 1081.

move the decimal point 2 times = 10.81