When you're finding a fraction in the simplest form, you have to find a common multiple, and the best way to do this is to list the multiples.
17- 1,17
34- 1,2,17,34.
In this case, the common multiple is 17, therefore, you need to divide both sides by 17. 17/17= 1. 34/17=2.
Therefore, 17/34 in the simplest form is 1/2.
Hope this helps :)
