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Here is a classroom-ready 15-minute lesson designed to pair directly with the Math-Aids Multiplying Decimals Worksheet. 

15-Minute Math Lesson Plan: Multiplying Decimals

Grade Level: Grades 5–6
Time: 15 minutes
Topic: Multiplying decimals

Learning Objective

Students will multiply decimal numbers accurately by multiplying as if the numbers were whole numbers, then placing the decimal point correctly in the product.

Materials

1. Warm-Up (3 minutes)

Review decimal place value.

Write these numbers on the board:

  • 2.4 × 3

  • 1.25 × 2

  • 0.6 × 4

Ask students to solve mentally or on paper.

Review: When multiplying decimals, first multiply without considering the decimal points. Then count the total number of decimal places in the factors to determine where the decimal point belongs in the answer.

2. Teacher Modeling (4 minutes)

Use the first problem from the worksheet:

98.63 × 18.51

Step 1: Count decimal places.

  • 98.63 has 2 decimal places.

  • 18.51 has 2 decimal places.

  • Together, the factors have 4 decimal places.

Step 2: Multiply as whole numbers.

Calculate 9863 × 1851 = 18,256,413.

Step 3: Place the decimal point.

Move the decimal point 4 places from the right.

Answer: 1,825.6413

Explain that the product must have four decimal places because the two factors have a total of four decimal places.

3. Guided Practice (3 minutes)

Work through this worksheet problem together:

59.95 × 87.55

  1. Count the decimal places: 2 + 2 = 4.

  2. Multiply 5995 × 8755 = 52,486,225.

  3. Place the decimal point four places from the right.

Answer: 5,248.6225

Ask students:

  • Why do we count four decimal places?

  • What would happen if we placed the decimal point in the wrong position?

4. Independent Worksheet Practice (3 minutes)

Have students solve these three problems from the worksheet independently:

  1. 21.76 × 16.53

  2. 71.92 × 29.62

  3. 78.35 × 59.87

Remind students to:

  • Multiply the numbers as whole numbers first.

  • Count the decimal places in both factors.

  • Place the decimal point in the product.

  • Check whether the answer is reasonable.

Teacher check: The answers are 359.6928, 2,130.2704, and 4,690.8145, respectively.

5. Exit Ticket (2 minutes)

Ask students to solve:

10.21 × 59.36

Students should show their multiplication and explain how they determined the decimal placement.

Answer: 606.0656

Differentiation

Support: Let students mark the decimal places in both factors before multiplying. Provide a place-value chart if needed.

Extension: Ask students to explain why multiplying two numbers with two decimal places each produces a product with four decimal places.

Common Misconceptions

  • Misplacing the decimal point: Count the decimal places in both factors before beginning.

  • Making multiplication errors: Encourage students to check partial products carefully.

  • Forgetting zeros: Include placeholder zeros when needed to maintain the correct number of decimal places.

Assessment

Observe students during guided practice and check their independent work and exit ticket.

Success Criteria: Students can multiply decimal factors, count the combined decimal places, place the decimal point accurately, and check their answers.

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Posted 10/15/26

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