Root Quiz on GCF, LCM prime factorization - Sue Scalia | Laabri

1

A prime number is....

a number that has more than 2 unique factors

a number that has only 2 unique factors, one and itself

always odd

the number 1

1

A composite number is....

always even

a number that has only 2 unique factors, one and itself

always odd

a number that has more than one set of factors

1

Which of the following number is NOT prime?

7

3

9

17

1

Which of the following are composite numbers? Choose ALL that apply.

25

19

21

40

For the problems in the following section, you must show your work in the space below. You may use any method you choose.

1

What is the GCF (greatest common factor) of 24 and 36? Show your work and use any method you choose.

1

What is the GCF (greatest common factor) of 45 and 35? Show your work and use any method you choose.

1

What is the LCM (least common multiple) of 8 and 6? Show your work and use any method you choose.

48

2

24

18

1

What is the LCM (least common multiple) of 10 and 6? Show your work and use any method you choose.

For the problems in the following section, you must show your work in the space provided. You may use a factor tree or any other method you choose.

1

Use a factor tree to find the prime factorization of 40.

2 x 10 x 2

2 x 2 x 2 x 5

5 x 8

2 x 20

1

Use a factor tree to find the prime factorization of 32.

2 x 2 x 2x 2

2x 8 x 2

2 x 2 x 2 x 2 x 2

4 x 8

1

Find the prime factorization of 88

2 x 2 x 2x 10

2 x 44

2 x 2 x 2 x 11

4 x 22

1

Lily used a factor tree to find the prime factorization of the number 24. Lily's teacher told her the solution was incorrect. Click on the Show Your Work space below and find Lily's error.

2 times 2 does not equal 4

3 times 3 does not equal 6

4 x 6 does not equal 24

1

Help Lily out by identifying the correct prime factorization of 24.

2 x 2 x 2 x 3

4 x 6

2 x 2 x 3 x 3

2 x 2 x 6

1

1 is a factor of every number.

Nokorɛ

Ɛnyɛ ampa