Provide useful math worksheets: Several free math worksheets are available online. Parents can download and provide these to their children as working on these worksheets surely improves their skills. Parents can also encourage them to practice these worksheets repeatedly. It is one of the convenient ways to brush up your knowledge on a particular topic.
There are some new materials being developed now based on what we are learning about how the brain learns. These brain_friendly materials should be an improvement over what has existed. I recently bought a book by Marcia L. Tate titled "Mathematics Worksheets Don't Grow Dendrites." I highly recommend her book. She gives a great deal of information on alternative activities that are better for your child's brain development and for learning.