84

64

84

64

64

64

20

64

20

64

1

20

64

1

20÷2

64÷2

1

10

32

1

10÷2

32÷2

1

5

16

or

84

64

64

64

20

64

20

64

1

20

64

1

20

64

1

2 × 2 × 5

2 × 2 × 2 × 2 × 2 × 2

1

1

5

16

or

Common Divisors for 20 and 64 are: 2 and 2

Greatest Common Divisor = 2 × 2 = 4

1

84÷4

64÷4

1

5

16