72

63

72

63

63

63

9

63

9

63

1

9

63

1

9÷3

63÷3

1

3

21

1

3÷3

21÷3

1

1

7

or

72

63

63

63

9

63

9

63

1

9

63

1

9

63

1

3 × 3

3 × 3 × 7

1

1

1

7

or

Common Divisors for 9 and 63 are: 3 and 3

Greatest Common Divisor = 3 × 3 = 9

1

72÷9

63÷9

1

1

7