How do you do fraction ,like 20 on top line then 30 on bottom ,i was bad art math sorry explaine to my daughter so she can finish home work .

Alright, so since I don't have an example question, I will make one up. 

there are 8 coins in total. there are 6 dimes. What is the fraction of dimes to coins. 

you would put the amount of dimes on the top and the total on the bottom.

6/8 which can be simplified to 3/4

Or another Example:

There are 12 pieces in the pizza. Billy took 4. what is the fraction of the slices left.

it would be 4-12= 8

8/12 which can be simplified to 4/6 and then to 2/3

Hope that helped.

They are somewhat similar