1.1.2c

Complete the factor tree.

a

b

c

7

35

2

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

30

2

3

10

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

• 4

• 7

• 9

• 3

• 1

• 5

• 18

• 8

• 6

• 2

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

Groups:

(a) Factors

,

(b) Not Factors

• 15

• 4

• 30

• 10

• 5

• 9

• 6

• 2

• 1

• 3

What factors do 18 and 30 have in common?

Groups:

(a) Common Factors

,

(b) Uncommon Factors

• 3

• 2

• 5

• 1

• 6

• 9

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

4

7

3

2

What factors do 54 and 72 have in common?

Groups:

(a) Common Factors

,

(b) Uncommon Factors

• 9

• 12

• 6

• 2

• 8

• 3

• 4

• 18