99

27

99

27

81

27

18

27

18

27

3

18

27

3

18÷3

27÷3

3

6

9

3

6÷3

9÷3

3

2

3

or

99

27

81

27

18

27

18

27

3

18

27

3

18

27

3

2 × 3 × 3

3 × 3 × 3

3

2 × ~~3~~ × ~~3~~

3

2

3

or

Common Divisors for 18 and 27 are: 3 and 3

Greatest Common Divisor = 3 × 3 = 9

3

99÷9

27÷9

3

2

3