1. Multiplication of Decimal Fractions
Unit 13
Multiplication of Decimal Fractions

2. Basic Principles of Multiplication of Decimal Fractions
To multiply decimal fractions, multiply the numbers following the same rules for multiplication of whole numbers.
Then count the number of decimal places to the right of the decimal point in both the multiplier and the multiplicand.

3. Basic Principles of Multiplication of Decimal Fractions
Start at the far right number in the product and count off the same number of decimal places to the left before placing the decimal point.
If extra places are needed in the answer, zeros are added on the left of the product before positioning the decimal point.

4. Multiplication of Decimal Fractions
Example: Find the product:
27.5 x 3.42
Multiply:
Add the decimals and
place in the product.

5. Practical Problem
A patient takes milligrams (mg) of Premarin bid (twice a day) for 5 days.
What is the total dose?

6. Practical Problem Multiply, then add the decimals and place in
the product.
The total dose is 6.25 mg.