ok i understand now what 3/4 means and i know what 1/2 of a cup is but what does 3/4 of a cup mean. You can do it with blocks but not with how much is in the cup. I don't understand. will someone help me?

You can do it with blocks. Let four blocks equal a cup, then three of them represent 3/4 of a cup.

thats easy enough thank you very much! I like to think of everything much more difficult I guess.