Lesson 8
Add and Subtract Fractions
Lesson Purpose
The purpose of this lesson is for students to add fractions with unlike denominators in a way that makes sense to them.
Lesson Narrative
In this lesson, students add and subtract fractions in a way that makes sense to them. They consider several important cases:
 The denominators of the two fractions are the same, which is review of work from a previous grade.
 One denominator is a multiple of the other so the fractions can be added by replacing only one of the fractions with an equivalent fraction.
 Neither denominator is a multiple of the other so a third new common denominator is needed to add the fractions.
 Action and Expression
 MLR8
Activity 2: Add and Subtract
Learning Goals
Teacher Facing
 Add and subtract fractions with unlike denominators in a way that makes sense to them.
Student Facing
 Let’s add and subtract fractions.
Required Materials
Materials to Copy
 Fraction Add and Subtract Sort
Required Preparation
Activity 1:
 Create a set of cards from the blackline master for each group of 2.
CCSS Standards
Addressing
Lesson Timeline
Warmup  10 min 
Activity 1  15 min 
Activity 2  20 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
Which students had opportunities to share their diagrams and thinking during wholeclass discussion? How did you select these students?
Suggested Centers
 Would You Rather? (2–5), Stage 3: Compare Units in a Given System (Addressing)
 Compare (1–5), Stage 6: Add and Subtract Fractions (Supporting)
Print Formatted Materials
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Additional Resources
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