Splash Screen. Lesson Menu Five-Minute Check (over Lesson 9–1) Main Idea and Vocabulary Example...

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

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.

A. prime

B. composite

24 tables are to be placed together to form a rectangle. Is 24 a prime or composite number?

Find the Prime Factorization of a Number

Find the prime factorization of 54.

2 × 27

2 × 3 × 9

2 × 3 × 3 × 3

3 × 18

3 × 3 × 6

3 × 3 × 3 × 2

Answer: In order, the prime factorization of 54 is 2 × 3 × 3 × 3.

4. D0% 0%0%0%

A. 2 × 3 × 3

B. 2 × 2 × 3 × 9

C. 3 × 3 × 3 × 3

D. 9 × 9

Which shows the prime factorization of 81?

End of the Lesson

Five-Minute Check (over Lesson 9–1)

Image Bank

Math Tool Chest

Compare Fractions

4. D0% 0%0%0%

(over Lesson 9–1)

A. 1, 2, 3, 6, 9

B. 1, 2, 3, 4, 6, 9

C. 1, 2, 3, 6

D. 6, 9

Find the common factors of 12 and 18.

4. D0% 0%0%0%

(over Lesson 9–1)

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

Find the common factors of 20, 24, and 28.

4. D0% 0%0%0%

(over Lesson 9–1)

C. 3, 5

D. 1, 5

Find the GCF of 15 and 20.

4. D0% 0%0%0%

(over Lesson 9–1)

A. 1, 3, 4, 6, 7

C. 1, 7

Find the GCF of 21, 28, and 35.

Splash Screen. Lesson Menu Five-Minute Check (over Lesson 9–1) Main Idea and Vocabulary Example...

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