1.1.2c

Complete the factor tree.

a

b

c

2

7

35

Which shows the prime factorization of 70?

• 2 x 5 x 7
• 2 x 3 x 5
• 10 x 7
• 2 x 35 x 7

Complete the factor tree.

d

c

b

a

2

10

30

3

Which shows the prime factorization of 90?

• 2 x 3 x 3 x 5
• 3 x 3 x 3 x 5
• 2 x 2 x 3 x 5
• 2 x 3 x 3 x 2

Sort the following numbers as "Factors of 18" or "Not Factors of 18"

Groups:

(a) Factors

,

(b) Not Factors

• 3

• 7

• 2

• 18

• 1

• 5

• 4

• 8

• 6

• 9

Sort the following numbers as "Factors of 30" or "Not Factors of 30"

Groups:

(a) Factors

,

(b) Not Factors

• 6

• 30

• 15

• 5

• 4

• 1

• 9

• 3

• 2

• 10

What factors do 18 and 30 have in common?

Groups:

(a) Common Factors

,

(b) Uncommon Factors

• 5

• 3

• 9

• 2

• 1

• 6

The Greatest Common Factor (GCF) of 18 and 30 is ​ (a)  

• 6
• 9
• 3
• 2

Finish the table of prime factors of 54 and 72.

a

b

7

3

2

4

What factors do 54 and 72 have in common?

Groups:

(a) Common Factors

,

(b) Uncommon Factors

• 8

• 2

• 6

• 9

• 3

• 4

• 12

• 18