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.
Nowadays, a lot of people are too dependent on calculators. Maybe because when they were young, they find math boring. We just need to teach our kids interesting and fun way in dealing with math. Math can be fun especially when you look at math in a completely different way.