There was a time that the United States of America had some of the highest mathematic scores in the world for students in grades k through 12. A lot has changes since those days, and in order to help children get back on the path to being good mathematical students parents need to play an important role.
Go Shopping! : You can cater this to all different ages. For young children, you can do a 'mock shop' and let them pretend to go shopping in a pretend store (your kitchen). Label certain items with easy to read prices and print some pretend money for them to shop with! For older children, you can let them help you in the actual grocery store with a specific shopping list. You can even set specific spending limits and give a specific amount of items and let them determine what they can afford, etc.
Some have a time limit to complete tasks, much like a game. If the math problems are not completed in time, a buzzer sounds indicating that they are out of time. This raises the competitive level from simply completing tasks to competing for how quickly they can do it, and do it correctly.
In addition to good teachers and involved parents, children should be involved in extracurricular activities that support math. In the state of Michigan, students can join a club at their school that plays a game called Academic Games. This form of gaming is challenging for children. It helps them to develop their academic skills as well as their math skills. Children can start playing these games as early as the second grade. This form of gaming will teach children how to play the game of Equations, a form of Algebra, at the age of seven. These skills are called Higher Order Thinking Skills.