Submarine sandwiches not only taste good, they also make for great math models. Follow along as Zoe explains how to calculate equivalent fractions, while cutting up a sandwich for herself and her friend. She demonstrates the process using both multiplication and division, emphasizing that the numerator and denominator are treated the same. Be sure to stop and explain to the class that by doing the same thing to each part of the fraction, the value of the fraction does not change. Use this presentation and assessment to supplement you instruction of this key math concept.

Concepts

common factors, fractions reducing, fractions, simplifying fractions, equivalent fractions, equivalent, numerators, denominators

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Additional Tags

finding equivalent fractions, math

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Pros

• Demonstrates the concept of equivalent fractions with visual models
• Uses a real-life context to explain equivalent fractions
• Assessment requires students to explain concepts related to equivalent fractions

Cons

• Process for simplifying fractions assumes prior knowledge of common factors
• Requires teacher to explain the logic behind the process for finding equivalent fractions

Common Core

3.NF.A.3.a 3.NF.A.3.b 4.NF.A.1 MP4 MP7