April 17, 2017
|
By Sarah Sumnicht

Lesson plan

Multiply Decimals

(23 ratings )
Download lesson plan
Do you need extra help for EL students? Try the Decimal Product ReasonablenessPre-lesson.
EL Adjustments
GradeSubjectView aligned standards

No standards associated with this content.

No standards associated with this content.

No standards associated with this content.

No standards associated with this content.

Which set of standards are you looking for?

Do you need extra help for EL students? Try the Decimal Product ReasonablenessPre-lesson.

Students will be able to multiply decimals using the standard algorithm.

The adjustment to the whole group lesson is a modification to differentiate for children who are English learners.
EL adjustments
(5 minutes)
  • Review the standard algorithm for multiplication with two-digit whole numbers (i.e., 16 x 74).
  • Tell students, "Today we are going to learn how to multiply decimals."
(10 minutes)
  • Write a decimal multiplication problem on the board (i.e., 0.24 x 0.97).
  • Explain that when multiplying decimals, you can ignore the decimal place and multiply using the standard algorithm normally.
  • Demonstrate by multiplying the two numbers (the product is 2,328).
  • Point out that both factors are less than one, and say, "What is one times one? If both factors are less than one, our product should be less than one."
  • Point out the answer you've written on the board (2,328) and ask, "Is this a logical answer?"
  • Explain that even though you can multiply normally, as you would with whole numbers, you must add the decimal back into the product in the correct place.
  • Tell students that the product will have the same number of digits behind the decimal place as both factors combined.
  • Count the digits behind the decimal in the factors (4). Then add the decimal into the product with the same number of digits behind it (i.e., 0.2328).
(15 minutes)
  • Guide students through another example (e.g., 7.96 x 0.4).
  • Give students a problem to solve with a partner (e.g., 0.37 x 5.2).
  • Give students a "try it" problem to solve independently (e.g., 0.61 x 1.85). Circulate and offer support as needed. Then go over the problem as a class.
(15 minutes)
  • Hand out the Multiplying Decimals worksheet and go over the example with the class.
  • Instruct students to complete the worksheet independently.
  • Circulate and offer support as needed.
  • Go over the worksheet with the class.

Support:

  • Provide additional examples before assigning independent work.
  • Have students highlight the numbers after the decimal place in the factors and in the product to make sure the decimal is in the correct place.

Enrichment:

  • Have students solve challenge problems with additional place values after the decimal (i.e., 84.0134 x 2.17).
(5 minutes)
  • Hand out a piece of scratch paper to each student.
  • Write a decimal multiplication problem on the board (e.g., 2.38 x 0.91) and have students solve.
  • Collect student work as an exit ticket and check for understanding.
(10 minutes)
  • Teach your students the "Multiplying Decimals Song" (see related media).

Add to collection

Create new collection

Create new collection

How likely are you to recommend Education.com to your friends and colleagues?

Not at all likely
Extremely likely

What could we do to improve Education.com?

Please note: Use the Contact Us link at the bottom of our website for account-specific questions or issues.

What would make you love Education.com?

What is your favorite part about Education.com?