28

70

28

70

28÷2

70÷2

14

35

14÷7

35÷7

2

5

or

28

70

2 × 2 × 7

2 × 5 × 7

2

5

or

Common Divisors for 28 and 70 are: 2 and 7

Greatest Common Divisor = 2 × 7 = 14

28÷14

70÷14

2

5

See 2/5 as a percent