76

72

76

72

72

72

4

72

4

72

1

4

72

1

4÷2

72÷2

1

2

36

1

2÷2

36÷2

1

1

18

or

76

72

72

72

4

72

4

72

1

4

72

1

4

72

1

2 × 2

2 × 2 × 2 × 3 × 3

1

1

1

18

or

Common Divisors for 4 and 72 are: 2 and 2

Greatest Common Divisor = 2 × 2 = 4

1

76÷4

72÷4

1

1

18