# Addition of Fractions with Unlike Denominators

Videos to help Grade 4 students learn how use visual models to add two fractions with related units using the denominators 2, 3, 4, 5, 6, 8, 10, and 12.

Common Core Standards: 4.NF.3a, 4.NF.3d, 4.NF.1, 4.MD.2

### NYS Common Core Grade 4 Module 5, Lesson 20

Lesson 20 Concept Development

Problem 1: Add unit fractions with related denominators using tape diagrams.
1/3 + 1/6 =
Lesson 20 Problem Set

1. Use a tape diagram to represent each addend. Decompose one of the tape diagrams to make like units. Then write the complete number sentence. Part (a) is partially completed.
2. Estimate to determine if the sum is between 0 and 1 or 1 and 2. Draw a number line to model the addition. Then write a complete number sentence. Part (a) has been completed for you.
3. Solve the following addition problem without drawing a model. Show your work.

Lesson 20 Homework

1. Use a tape diagram to represent each addend. Decompose one of the tape diagrams to make like units. Then write the complete number sentence.

2. Estimate to determine if the sum is between 0 and 1 or 1 and 2. Draw a number line to model the addition. Then write a complete number sentence. The first one has been completed for you.

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