5th Grade Math Lesson

Kitchen Math: Adding Fractions with Unlike Denominators

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5th GradeBTC Style / Thinking Classrooms50 min

Learning Objective

Students will be able to add two fractions with unlike denominators by finding a common denominator, rewriting equivalent fractions, and simplifying the result in real-world cooking contexts.

Lesson Overview

Students progress from adding fractions with related denominators (one is a multiple of the other) through adding fractions requiring a common denominator, culminating in multi-step fraction addition in a cooking context. Each task changes only one variable to build confidence and conceptual understanding.

Materials

Vertical whiteboards or chart paper
Dry-erase markers
Erasers or rags
Random grouping tool
Fraction strips (optional manipulative)

Scaffolded Task Progression

1Task 1

A muffin recipe uses

\frac{1}{4}

cup of sugar in the batter and

\frac{1}{4}

cup of sugar in the topping. How much sugar is needed in total?

Add:

\frac{1}{4} + \frac{1}{4} = ?

2Task 2

A smoothie recipe calls for

\frac{1}{4}

cup of honey and

\frac{1}{2}

cup of yogurt. What is the total amount of ingredients?

Add:

\frac{1}{4} + \frac{1}{2} = ?

[ Interactive graph / diagram, available in the full lesson ]

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