Definition of a Fraction: A fraction is part of a whole. For example: One piece of pizza is part of the whole pizza. If the pizza is cut into four equal pieces, each piece is 1/4 of the pizza. (One of four pieces). Two pieces would be 2/4 (2 pieces). And three pieces of pizza would be 3/4 (3 pieces out of 4 pieces.)
Here are some games you can play to improve your fractions knowledge.
This one is a little harder.
This video will also help you.