Question

What are different ways you can write 1/2

Answer 1

In terms of equivalent fractions, look at the other guy. In terms of other forms:
1:1 (Ratio)
0.5 (Decimal)
50% (Percentage)

Answer 2

2/4
3/6
4/8
5/10
6/12
7/14
8/16
9/18
10/20