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K-5 Grade 5 Unit 6 Lesson 13

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Lesson 13

Warm-up Activity 1 Activity 2

Unit 6, Lesson 13

Put It All Together: Add and Subtract Fractions

Grade 5

Warm-up

Find the value of each expression mentally.

Activity 1

Tyler says: “I can find the sum, using 18 as a common denominator.”

Han says: “I can find the sum, using 24 as a common denominator.”

Clare says: “I can find the sum, using 48 as a common denominator.”

With whom do you agree? Explain or show your reasoning.
What is the value of ?
Are there other common denominators you can use to find the sum? Explain or show your reasoning.

Activity 2

Find the value of each expression. Explain or show your reasoning.

Standards Alignment

Building On

Addressing

5.NF.1

Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)

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Building Toward

Standards Alignment

Building On

Addressing

5.NF.1

Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)

View Full Standard

Building Toward

Standards Alignment

Building On

Addressing

5.NF.1

Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)

View Full Standard

Building Toward