81

36

81

36

72

36

9

36

9

36

2

9

36

2

9÷3

36÷3

2

3

12

2

3÷3

12÷3

2

1

4

or

81

36

72

36

9

36

9

36

2

9

36

2

9

36

2

3 × 3

2 × 2 × 3 × 3

2

2 × 2 × ~~3~~ × ~~3~~

2

1

4

or

Common Divisors for 9 and 36 are: 3 and 3

Greatest Common Divisor = 3 × 3 = 9

2

81÷9

36÷9

2

1

4