63

81

63

81

63÷3

81÷3

21

27

21÷3

27÷3

7

9

or

63

81

3 × 3 × 7

3 × 3 × 3 × 3

7

9

or

Common Divisors for 63 and 81 are: 3 and 3

Greatest Common Divisor = 3 × 3 = 9

63÷9

81÷9

7

9

See 7/9 as a percent