90

63

90

63

63

63

27

63

27

63

1

27

63

1

27÷3

63÷3

1

9

21

1

9÷3

21÷3

1

3

7

or

90

63

63

63

27

63

27

63

1

27

63

1

27

63

1

3 × 3 × 3

3 × 3 × 7

1

1

3

7

or

Common Divisors for 27 and 63 are: 3 and 3

Greatest Common Divisor = 3 × 3 = 9

1

90÷9

63÷9

1

3

7