78

72

78

72

72

72

6

72

6

72

1

6

72

1

6÷2

72÷2

1

3

36

1

3÷3

36÷3

1

1

12

or

78

72

72

72

6

72

6

72

1

6

72

1

6

72

1

2 × 3

2 × 2 × 2 × 3 × 3

1

1

1

12

or

Common Divisors for 6 and 72 are: 2 and 3

Greatest Common Divisor = 2 × 3 = 6

1

78÷6

72÷6

1

1

12