50

20

50

20

40

20

10

20

10

20

2

10

20

2

10÷2

20÷2

2

5

10

2

5÷5

10÷5

2

1

2

or

50

20

40

20

10

20

10

20

2

10

20

2

10

20

2

2 × 5

2 × 2 × 5

2

2

1

2

or

Common Divisors for 10 and 20 are: 2 and 5

Greatest Common Divisor = 2 × 5 = 10

2

50÷10

20÷10

2

1

2