66

99

66

99

66÷3

99÷3

22

33

22÷11

33÷11

2

3

or

66

99

2 × 3 × 11

3 × 3 × 11

2 × ~~3~~ × ~~11~~

2

3

or

Common Divisors for 66 and 99 are: 3 and 11

Greatest Common Divisor = 3 × 11 = 33

66÷33

99÷33

2

3

See 2/3 as a percent