what is bigger ?5/8 or 3/4

3/4 because think of the decimals 3/4 is 75 and 5/8 is 0.625

No because if you line them up like this: 3.4 
5.8
Then you can see that since 3 is smaller than 5, 3.4 is defiantly smaller than 5.8!

You can do this with any decimal..if one is longer than another, just add a zero to make the places equal! For ex:
4.59183 and 3.65 which is bigger?? well: 4.59183
3.65
as you can see 4.59183 is longer than 3.65 so I adjust it like this: 4.59183
3.65000
Hope this Helped :