27

18

27

18

18

18

9

18

9

18

1

9

18

1

9÷3

18÷3

1

3

6

1

3÷3

6÷3

1

1

2

or

27

18

18

18

9

18

9

18

1

9

18

1

9

18

1

3 × 3

2 × 3 × 3

1

2 × ~~3~~ × ~~3~~

1

1

2

or

Common Divisors for 9 and 18 are: 3 and 3

Greatest Common Divisor = 3 × 3 = 9

1

27÷9

18÷9

1

1

2