Imagine it's your birthday party and you have a huge chocolate cake. 

To share your cake with your friends, you will need to cut it up into pieces.

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Each piece is a fraction.

If you cut your cake into 4 parts, 1 piece would be 1 out of 4:

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If you take 2 pieces from that cake it will be 2/4

3 pieces would be 3/4

4 pieces would be 4/4, which is the whole cake!

From smallest to biggest: 1/4, 2/4, 3/4 and 4/4