10

80

10

80

10÷2

80÷2

5

40

5÷5

40÷5

1

8

or

10

80

2 × 5

2 × 2 × 2 × 2 × 5

1

8

or

Common Divisors for 10 and 80 are: 2 and 5

Greatest Common Divisor = 2 × 5 = 10

10÷10

80÷10

1

8

See 1/8 as a percent