Decimal Arithmetic

Multiplication

Two decimal numbers may be multiplied as follows:

• the numbers are written one below the other with the rightmost digit aligned
• starting on the right, multiply each digit in the top number by each digit in the bottom number, just as with whole numbers (ignore the decimal points)
• add the products
• place the decimal point in the answer by starting at the right and moving a number of places equal to the sum of the decimal places in both numbers multiplied

Example 3A.

Let us calculate:  

Example 3B.

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Exercise 3.

Perform the following multiplication without using a calculator:

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