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Five-Minute Check (over Lesson 9–1) Main Idea and Vocabulary Example 1: Use Models Example 2: Use Factor Pairs Example 3: Find the Prime Factorization of a Number • I will identify prime and composite numbers. • prime factorization Use Models Tell whether the number 14 represented by the model is prime or composite. The model shows 2 rows of 7 squares. The squares could also be arranged in 7 rows of 2 squares, 14 rows of 1 square, or 1 row of 14 squares, as shown below. Answer: So, the number 14 is a composite number because it has more than 2 factors. Tell whether the number 8 represented by the model is prime or composite. A. prime B. composite 1. 2. m po si te 0% co pr im e 0% A B Use Factor Pairs 19 square tables are to be placed together to form a rectangle. Is 19 a prime or composite number? What does it mean in this problem? factors of 19: 1, 19 Answer: Since the number 19 only has two factors, it is a prime number. This means there is only one way to place the tables. 24 tables are to be placed together to form a rectangle. Is 24 a prime or composite number? A. prime B. composite 1. 2. 0% A 0% B A B Find the Prime Factorization of a Number Find the prime factorization of 54. 54 54 2 × 27 3 × 18 2×3 × 9 3×3 × 6 2×3×3×3 3×3×3×2 Answer: In order, the prime factorization of 54 is 2 × 3 × 3 × 3. Which shows the prime factorization of 81? A. 2×3×3 B. 2×2×3×9 C. 3×3×3×3 D. 9×9 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D End of the Lesson Five-Minute Check (over Lesson 9–1) Image Bank Math Tool Chest Compare Fractions (over Lesson 9–1) Find the common factors of 12 and 18. A. 1, 2, 3, 6, 9 B. 1, 2, 3, 4, 6, 9 C. 1, 2, 3, 6 D. 6, 9 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D (over Lesson 9–1) Find the common factors of 20, 24, and 28. A. 1, 2, 4 B. 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14 C. 1, 2, 3, 4, 6, 12, 14 D. 2, 4 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D (over Lesson 9–1) Find the GCF of 15 and 20. A. 4 B. 5 C. 3, 5 D. 1, 5 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D (over Lesson 9–1) Find the GCF of 21, 28, and 35. A. 1, 3, 4, 6, 7 B. 3 C. 1, 7 D. 7 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D