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

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Lessons for Grade 4

Common Core For Grade 4

Lesson 21 Concept Development

Problem 1: Add two fractions with related units modeled with a tape diagram. Use a number bond to rename the sum as a mixed number.

3/8 + 3/4 =

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

2. Draw a number line to model the addition. Then write a complete number sentence. Use a number bond to write each sum as a mixed number.

3. Solve. Write the sum as a mixed number. Draw a model if needed.

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

2. Draw a number line to model the addition. Then write a complete number sentence. Use a number bond to write each sum as a mixed number.