Curriculum Library

Fractions Big Idea 6: Adding/Subtracting Proper Fractions with Uncommon Denominators

Key Concept: Fractions can be rewritten so they have the same denominator, which does not change their value.

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Lesson Sequences

F.6-1-1 Model Common Denominators for Related Fractions  |
View Lesson Opener Talk-About (8-10 min)
View Guided Lesson Manipulate two models linked to numbers so that two related fractions have a common denominator. (8-15 min)
View Lesson Closer Explain & Solve (5 min)
F.6-1-2 Add/Subtract Related Fractions Using Models  |
View Lesson Opener Hands-On (8-10 min)
View Guided Lesson Use models to find a common denominator for two related fractions in order to complete addition or subtraction equations. (8-15 min)
View Lesson Closer Apply Your Knowledge (5 min)
F.6-1-3 Model/Write Common Denominators-Related Fractions  |
View Lesson Opener Talk-About (8-10 min)
View Guided Lesson Use models and the “one” fraction procedure to find a common denominator for two related fractions. (8-15 min)
View Lesson Closer Agree/Disagree (5 min)
F.6-1-4 Add/Subtract Related Fractions Using "1" Fraction  |
View Lesson Opener Think-Pair-Share (8-10 min)
View Guided Lesson Use models and the “one” fraction procedure to solve addition and subtraction equations with related fractions (8-15 min)
View Lesson Closer Apply Your Knowledge (5 min)
Real World Investigation Part 1    
View Camp Mid-River's Flags: Camp Mid-River's Data
Key Concept: If two fractions are related, then an equivalent form of one fraction can be written so that its denominator is the same as the second fraction.

Lesson Sequences

F.6-2-1 Find Common Denominators for Related Fractions  |
Lesson Plan
View Lesson Opener Talk-About (8-10 min)
View Guided Lesson Use the “one” fraction procedure to find a common denominator for two related fractions with and without models. (8-15 min)
View Lesson Closer Explain & Solve (5 min)
F.6-2-2 Add/Subtract Related Fractions Using Equations  |
Lesson Plan
View Lesson Opener Think-Pair-Share (8-10 min)
View Guided Lesson Use the “one” fraction procedure to solve addition and subtraction equations with related fractions without using models. (8-15 min)
View Lesson Closer Explain & Solve (5 min)
F.6-2-3 Estimate Sums/Differences of Related Fractions  |
Lesson Plan
View Lesson Opener Walk-About (8-10 min)
View Guided Lesson Estimate the placement of addition and subtraction expressions with related fractions on a number line. (8-15 min)
View Lesson Closer Explain & Solve (5 min)
F.6-2-4 Add/Subtract Related Fractions with Unknowns  |
Lesson Plan
View Lesson Opener Talk-About (8-10 min)
View Guided Lesson Solve addition and subtraction equations containing related fractions with missing unknowns without models. (8-15 min)
View Lesson Closer Explain & Solve (5 min)
Real World Investigation Part 2    
View Camp Mid-River's Flags: Create Some Data
Key Concept: If two fractions are not related, then equivalent forms will be needed for both fractions before you can add or subtract the fractions.

Lesson Sequences

F.6-3-1 Model Common Denominators for Unlike Fractions  |
Lesson Plan
View Lesson Opener Talk-About (8-10 min)
View Guided Lesson Manipulate two models linked to numbers so that two unlike fractions have a common denominator. (8-15 min)
View Lesson Closer Explain & Solve (5 min)
F.6-3-2 Add/Subtract Unlike Fractions Using Models  |
Lesson Plan
View Lesson Opener Hands-On (8-10 min)
View Guided Lesson Use models to find a common denominator for two unlike fractions in order to complete addition or subtraction equations. (8-15 min)
View Lesson Closer Agree/Disagree (5 min)
F.6-3-3 Find Common Denominators for Unlike Fractions  |
Lesson Plan
View Lesson Opener Talk-About (8-10 min)
View Guided Lesson Use the “one” fraction procedure to find a common denominator for two unlike fractions with and without models. (8-15 min)
View Lesson Closer Explain & Solve (5 min)
F.6-3-4 Add/Subtract Unlike Fractions  |
Lesson Plan
View Lesson Opener Think-Pair-Share (8-10 min)
View Guided Lesson Solve addition and subtraction equations containing unlike fractions with missing unknowns without models. (8-15 min)
View Lesson Closer Apply Your Knowledge (5 min)
Real World Investigation Part 3    
View Your Flags: Your Data
Key Concept: Addition and subtraction of fractions can be used to solve a variety of problems.

Lesson Sequences

F.6-4-1 Compare Sums/Differences of Uncommon Fractions  |
Lesson Plan
View Lesson Opener Talk-About (8-10 min)
View Guided Lesson Use 4 strategies to compare fractions and fraction expressions with uncommon denominators (8-15 min)
View Lesson Closer Agree/Disagree (5 min)
F.6-4-2 Complete Fraction Equations with Unknowns  |
Lesson Plan
View Lesson Opener Talk-About (8-10 min)
View Guided Lesson Solve for the unknown in an addition or subtraction equation of fractions with uncommon denominators without the use of models. (8-15 min)
View Lesson Closer Explain & Solve (5 min)