42

18

42

18

36

18

6

18

6

18

2

6

18

2

6÷2

18÷2

2

3

9

2

3÷3

9÷3

2

1

3

or

42

18

36

18

6

18

6

18

2

6

18

2

6

18

2

2 × 3

2 × 3 × 3

2

2

1

3

or

Common Divisors for 6 and 18 are: 2 and 3

Greatest Common Divisor = 2 × 3 = 6

2

42÷6

18÷6

2

1

3