18

54

18

54

18÷2

54÷2

9

27

9÷3

27÷3

3

9

3÷3

9÷3

1

3

or

18

54

2 × 3 × 3

2 × 3 × 3 × 3

1

3

or

Common Divisors for 18 and 54 are: 2, 3 and 3

Greatest Common Divisor = 2 × 3 × 3 = 18

18÷18

54÷18

1

3

See 1/3 as a percent