This little web site shows you how to simplify fractions.

Here's a random fraction:

12

16

12÷2

16÷2

6

8

6÷2

8÷2

3

4

or

12

16

2 × 2 × 3

2 × 2 × 2 × 2

3

4

or

Common Divisors for 12 and 16 are: 2 and 2

Greatest Common Divisor = 2 × 2 = 4

12÷4

16÷4

3

4