90

36

90

36

72

36

18

36

18

36

2

18

36

2

18÷2

36÷2

2

9

18

2

9÷3

18÷3

2

3

6

2

3÷3

6÷3

2

1

2

or

90

36

72

36

18

36

18

36

2

18

36

2

18

36

2

2 × 3 × 3

2 × 2 × 3 × 3

2

2

1

2

or

Common Divisors for 18 and 36 are: 2, 3 and 3

Greatest Common Divisor = 2 × 3 × 3 = 18

2

90÷18

36÷18

2

1

2