If you have a child that struggles with math or simply enjoys math and needs to keep up with their skills, make it fun. My 4th grader loves math and she recommends the Sumdog website. In her words:
"When you play the math games you get coins depending on how many you get right and if you master that skill you get more coins. Then you can either use it to buy clothes or accessories for your character that you make or you can save up your coins for getting different animals. The different types of animals represent the different levels. It helps and encourages kids get to each level in order to obtain each animal."
This is a great way to make math fun for kids, as you can set it up to whatever grade level your child is at, especially if you have a child that likes to play computer games.