Multiplying Decimals

1
Multiplying Decimals
2
Example

• 2.7
• x
• 3.5

3
Step 1

• Multiply as you normally would
• 27
• x
• 35
• 945

4
Step 2

• Count the number of digits
• behind a decimal point in the
• problem. This one has two
• digits behind the decimal
• point, the 7 and the 5.
• 2.7 x 3.5

5
Step 3

• Put the decimal point in the
• answer. If your problem had 2
• digits behind a decimal point, your
• answer should have 2 digits
• behind a decimal point.

6

• If your problem
• had 3 digits behind a
• decimal point, your
• answer should have 3 digits
• behind a decimal point.

7

• If your problem
• had 4 digits behind a
• decimal point, your
• answer should have 4 digits
• behind a decimal point.

8
Step 4

• Add zeros if needed.

9
Lets try a few together.
10
7.56 x 3.8 287.28
2872.8 28.728
11
.3445 x 3.9 1.34355 13.4355 134.355
12
13.723 x 122.5
16.810675 168.10675 1681.0675
13
.55 x .007

• 38.5
• .00385
• .0385

14
Youre correct!
15
Incorrect, try again

• Remember to count the digits behind the decimal
  points in the problem.
• You must have this many digits behind the decimal
  point in the answer.