Contact your school district’s superintendent and request a copy of the standards they use to formulate the curriculum. You need to determine what your child already knows and review those topics before tackling new skills.
Meet your child at his level. At this age, he is likely to grasp concrete examples more easily than theoretical information. Use tangible objects that he can manipulate while he practices; play money and objects to count while he adds are useful.
Purchase or design worksheets to reinforce lessons before you teach a new topic. Work through several problems until you are certain that she understands then allow her to solve problems independently. Offer assistance when necessary, but ask her to explain how she is solving the problems.
Evaluate worksheets not only for correct answers but also for common errors. Is he frequently forgetting to work from right to left or misnaming a shape?
Review concepts on a weekly basis and test several skills in one exam at the end of a unit. Regular reinforcement aids long-term retention and teaches him that math builds upon previously learned skills.
Practice math skills in everyday life: count oranges as you add them to the grocery cart or subtract brownies as you remove them from the pan. Introduce fractions when serving a pie or dividing soccer balls among teammates.