Greg Tang Math: Click on the "Games and Resources" tab at the top of the page to play the math games online.
Does your child need extra instruction in a specific math skill? If so, try Khan Academy. Khan Academy explains just about any math topic instructed in your child's math class. Just enter the specific topic in the search bar and click on a video tutorial. Khan also provides practice of the skill as well. You may need to create an account to access the tutorials and math exercises.