1/4 is one quarter. Four quarters makes a whole. Think of it as a dollar. One quarter is equal to 25 cents. Four quarters equals a dollar. So 1/4=0.25.
1/5 is fairly easy. Divide 100 by 5, and you get 20. The decimal could be written as 0.20, or just 0.2. They're pretty much the same thing.
1/6 is a little harder. You should just divide 100 by 6 on a calculator. But to help you finish the problem quicker, I'll just calculate it myself. It's about 0.167. But the full answer would be 0.1666...
1/8 is also a hard one. But you can just Google it haha. It's 0.125.
1/9 is also quite the challenge. I Googled this one as well. It's 0.111...
1/10 is actually very easy. Think of it as 10/100. That would be 0.10, or just 0.1. I did not use Google for this one.
Now I'm getting a little lazy so I'll just give you the rest.
1/11=0.0909...
1/12=0.08333...
Hope this helps :-)