1. The Number System
Multiplying Decimals
© 2013 Meredith S. Moody

2. Objective: You will be able to…
Multiply multi-digit decimals
© 2013 Meredith S. Moody

3. Multiplying Decimals Write the number with more digits
Step 1:
Write the number with more digits
Step 2:
Write the second number beneath the first; line up the DIGITS!
Step 3:
Multiply the numbers normally
Step 4:
Count the total number of digits after the decimals in the problem
Step 5:
Count the same number of digits in your answer (starting at the end of the number – count backwards)
Step 6:
Put the decimal in front of the final digit you count
© 2013 Meredith S. Moody

4. Example 1
© 2013 Meredith S. Moody

5. Example 2
© 2013 Meredith S. Moody

6. You try
0.3 x 5.391
1.6173
23.41 x 6.5
1.88 x 365.3
© 2013 Meredith S. Moody

7. Mistakes
What are some mistakes you think people make when multiplying decimals?
Lining up the decimals instead of the digits
Putting the decimal in the wrong place in the answer
Why do you think they make those mistakes?
Adding & subtracting decimals have different rules
How do you remember not to make those mistakes?
© 2013 Meredith S. Moody