If you want to figure out what 35/50 is as a decimal, remember to always put it in over 100, or 10, 100, or 1,000, or another power of 10 in the denominator.
In this case, it's just easier to put it over 100. So set it up like this:
35 times 2 70
_____ = _____
50 times 2 100
Answer is 70/100
Hope this helps, have a good day. c;