70

30

70

30

60

30

10

30

10

30

2

10

30

2

10÷2

30÷2

2

5

15

2

5÷5

15÷5

2

1

3

or

70

30

60

30

10

30

10

30

2

10

30

2

10

30

2

2 × 5

2 × 3 × 5

2

2

1

3

or

Common Divisors for 10 and 30 are: 2 and 5

Greatest Common Divisor = 2 × 5 = 10

2

70÷10

30÷10

2

1

3