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Name Homework 9.3 Date Greatest Common Factor Different Ways to Find the GCF of 15 and 20 Way 1: Make a list. 15: 1, 3, 5, 15 20: 1, 2, 4, 5, 10, 20 Way 2: Use prime factorization. 15 ⫽ 3 ⫻ 5 20 ⫽ 22 ⫻ 5 The GCF is 5. List the factors of each number. Then find the greatest common factor of the numbers. 1. 16, 42 2. 21, 25 3. 24, 56 4. 12, 30 Write the prime factorization using exponents of each number. Then find the greatest common factor (GCF) of the numbers. 5. 24, 36 6. 21, 56 7. 45, 81 8. 50, 75 Problem Solving 9. Tia made 50 cupcakes and 160 cookies for a bake sale. She put the items in packages with an equal number of cupcakes and cookies. How many packages did she make? What was in each package? Copyright © Houghton Mifflin Company. All rights reserved. Show Your Work Use with text pages 228–231.