Using 'manipulatives' in math is a wonderful way to assist students in skill development. What I mean by manipulatives is that kids actually have an object that is representative of a unit of measure (number, weight, measurement, money, etc.) and they use them to learn about math. It is great because they use many intelligences (visual, kinesthetic, etc.).
For money, turn your living room into a toy store and play 'shopping' with your child's existing toys. Set prices for the various items, like a hot wheels car is $.17, a stuffed animal is $.25, etc. (I'm not saying withhold the toys - that would be mean!) Make it like a little simulation where you give him or her a bag of coins and role play 'buying' items.
You could also use it in conjunction with household chores as an incentive. (S)He makes his bed, (s)he gets to pick out $.14 (or whatever) to put into a piggy bank/savings jar. At the end of the week, (s)he can open the jar and count his/her change to figure out how much (s)he earned. Take him/her to the toy or grocery store and let him/her buy something or if you're opposed to that sort of reward, tell him/her once he has earned X amount of money, (s)he gets to pick a special dinner or do something special with mommy and daddy.
-Use real coins that (s)he can touch and see
-Create games that are fun for him/her to practice and use the skills
-Create rewards that necessitate him/her knowing about coins; (s)he may be more motivated that way