Lesson Plan

Adding Like Mixed Numbers

Solve for the sum of two mixed numbers! They will use scaffolds such as fraction models to support the visualization of mixed numbers. This can be used on its own or as support for the lesson Sums for Mixed Numbers and Improper Fractions.
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This lesson can be used as a pre-lesson for the Sums for Mixed Numbers and Improper Fractions lesson plan.
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This lesson can be used as a pre-lesson for the Sums for Mixed Numbers and Improper Fractions lesson plan.

Objectives

Academic

Students will be able to add like mixed numbers and improper fractions using the counting up strategy with number lines.

Language

Students will be able to explain their mathematical thinking using grade-level vocabulary, visuals, and sentence stems.

Introduction

(5 minutes)
Mixed Fraction Addition with Like Denominators #3Mixed Fraction Addition with Like Denominators #4Vocabulary Cards: Adding Like Mixed NumbersGlossary: Adding Like Mixed NumbersTeach Background Knowledge TemplateWrite Student-Facing Language Objectives Reference
  • Pose this problem to students: "A cake recipe calls for 1 ⅓ cup of brown sugar and 1 ⅔ cup of white sugar. How much sugar does the recipe need?"
  • Tell students to consider what the problem is asking, what mathematical operation they think the problem will require, and which strategies they may use to solve it. Have them turn to a partner and discuss the problem.
  • Invite a few students to share their thinking and record their responses.
  • Tell students that the two numbers in the word problem are called mixed numbers. Show students the vocabulary card with this term, read aloud the definition and state a few examples. Ask students to share other instances when they have seen mixed numbers in the real world.