One great way to teach it is by using math worksheets. One could make worksheets that are fun for children to complete. Adding graphics such as fruit and candy and having the children add them up will open their minds to it and have them learning in a fun way. Also, the sense of accomplishment the child has after completing the math worksheet correctly will encourage him to continue learning the subject.
This is one subject that does not go away once graduation is over. It is a subject that everyone is faced with on a daily basis. One may not realize it, but everyday math is out there, whether it is at the local grocery store or in the classroom. Keep the subject fresh in the mind, and the person will succeed in life.