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.
Math is a science of dealing with the logic of quantity, shape, and arrangement. It started way back in history. The earliest use of math was in trading, land measurement, painting, and weaving patterns. Math actually coordinates all of the basic learning skills of many subjects such as comprehension, application, and technicalities.