Lesson 13
Divide Whole Numbers by Unit Fractions
Lesson Purpose
Lesson Narrative
In this lesson students investigate dividing a whole number by a unit fraction using the context of strips of paper. In the warmup, they describe what they notice and wonder about a picture of a quilt. During Activity 1, they consider cutting paper strips and using the strips to make a paper quilt. In Activity 2, as they did for division of a unit fraction by a whole number, students use a tape diagram which has the additional advantage of resembling the strips of paper. They observe how the quotient depends on the size of the dividend and represent the quotient with an equation. It may be helpful for students to actually make paper quilts. If possible, cut 2 foot length pieces of construction paper in various colors before the lesson and ask students to follow the directions in the problem prompts to make smaller pieces of each color. After the lesson, students can use the pieces to create a paper quilt.
 Representation
Learning Goals
Teacher Facing
 Divide a whole number by a unit fraction in context, in a way that makes sense to them.
Student Facing
 Let’s divide a whole number by a unit fraction.
Required Materials
Materials to Gather
Required Preparation
CCSS Standards
Lesson Timeline
Warmup  10 min 
Activity 1  20 min 
Activity 2  15 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
Suggested Centers
 Rolling for Fractions (3–5), Stage 4: Multiply Fractions (Addressing)
 Compare (1–5), Stage 4: Divide within 100 (Supporting)
 How Close? (1–5), Stage 7: Multiply Fractions and Whole Numbers to 5 (Supporting)
Print Formatted Materials
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Additional Resources
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