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# Subtracting Fractions with Common Denominators

4th Grade • 1 Lesson Plan
$2.00

## Quick Facts

Subject: Math, Numbers and Operations Fractions

Type: 1 Lesson Plan

Skills:

- Collaborate with peers to practice the "language" of math
- Construct viable arguments and critique the reasoning of others

- Practice subtracting fractions using number lines, grids and puzzle models in order to model with mathematics
- Decompose a fraction into a sum of fractions with the same denominator in more than one way
- Solve real world tasks involving subtraction of like fractions
- Rename improper fractions as equivalent mixed numbers
- Complete an exit slip to help you determine next instructional steps

Materials Needed:

- Blank paper (1 per student) and/or small individual white boards for each student
- Document camera or white board

Printable Resources:

**Student Copies:**- “Exit Slip” (1 copy per student)
- “Subtracting Fractions with Common Denominators”’ worksheet (print double sided if possible) (1 copy per student)
- “Subtracting Fractions Puzzles”’ worksheet (1 copy per student)

**Teacher Copies:**- “Exit Slip” Answer Key
- “Addition of Fractions” poster (1 copy for display)
- “Subtracting Fractions” poster (1 copy for display)
- “Subtracting Mixed Numbers” poster (1 copy for display)
- “Subtracting Fractions with Common Denominators”’ Answer Key (1 copy for display)

CCSS: 4.NF.3

## Lesson Plan Description

Our 4th graders need multiple opportunities to practice using fractions with different strategies so each student can “see” this complex skill in a way that makes sense to them. They will:

- Collaborate with peers to practice the “language” of math
- Construct viable arguments and critique the reasoning of others

- Practice subtracting fractions using number lines, grids and puzzle models in order to model with mathematics
- Decompose a fraction into a sum of fractions with the same denominator in more than one way
- Solve real world tasks involving subtraction of like fractions
- Rename improper fractions as equivalent mixed numbers
- Complete an exit slip to help you determine next instructional steps