Multiply or divide to solve word problems involving multiplicative comparison

Start lessonBegins with Multiplicative comparison word problems · Slides

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Lesson Plan →Objectives, pacing and practice, built from this lesson's brief.
Guided Notes →One page your students fill in and keep.
Exit Ticket →Three items at the end of class. No student accounts.
Re-teach →After an exit ticket: who missed what, and what to do tomorrow.
Homework →Assign practice; it grades itself.

4.OA.A.2

**4.OA.A.2**: Multiply or divide to solve word problems involving multiplicative comparison, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison.

4.OA.A.2: Multiply or divide to solve word problems involving multiplicative comparison, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison.

What you'll learn

Identify the three quantities in a multiplicative comparison word problem (the larger quantity, the reference quantity, and the comparison factor) and determine which quantity is unknown
Write a multiplication or division equation with a symbol for the unknown to represent a multiplicative comparison word problem
Solve multiplicative comparison word problems in all three unknown positions: unknown product (larger quantity), unknown factor (comparison factor), and unknown group size (reference quantity)
Distinguish a multiplicative comparison problem from an additive comparison problem and select the correct operation accordingly
Assess the reasonableness of an answer by checking whether the result makes sense given the comparison type (e.g., "times as many" should produce a larger number when the product is unknown)

Review first:

Interpret a multiplication equation as a comparison

Slides

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Multiplicative comparison word problems

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Practice

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Exercise

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