Children always find money a difficult concept as they frequently equate one coin with a value of 1p. To try to help them visualise that 1 coin may have a value greater than 1, I usually use the appropriate Numicon tiles to represent 1p, 2p, 5p and 10p coins. I would explain that it is just 1 Numicon tile, but it has a value of 1/2/5/10p. I attach a PDF and Word version of the Numicon tiles below.
There are 2 Powerpoint money activities which you could work through with your child, talking about the values involved before trying one of the activity sheets.