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Name Chapter 1, Lesson 3 Reteach Date Prime Factorization CA Standards NS 1.4, MR 2.3 Jason needs to find all of the factors of 60 for his math homework. Follow the steps he used to find the prime factorization of 60. Step 1 Find two numbers with a product of 60 (do not use 1 and 60). Write them as branches of a factor tree. 60 Step 2 Write each composite number as a product of two factors. Circle prime numbers. Continue until the numbers at the ends of branches are prime numbers. Step 3 Write all the prime number factors in order from least to greatest. 60 = 2 × 2 × 3 × 5 60 6 × 10 6 × 10 2×3×2×5 Solution: The prime factorization of 60 is 2 × 2 × 3 × 5. Complete each factor tree. Then write the prime factorization. 1. 2. 15 ×3 3 × 18 4. 5. × 2 9 3× × 9 3 × 20 6. 54 9 × 2 3 × 3. 21 6 × 2 ×3 5 × 4 5 × × Writing Math Explain how making a factor tree can help you find the prime factorization of a number. Reteach Use with text pages 12–13. Copyright © Houghton Mifflin Company. All rights reserved. 73745_C1L3_RET.indd 47 6/18/07 10:24:48 AM