Nowadays you can find a wide variety of online math programs. Honestly, as a teacher, I do not believe that any subject, especially mathematics, can be taught online. What is most important in the guidance is to be able to act personally. The only way I know to teach mathematics is face to face.
However, there are some online math programs that have proven to be quite helpful. For example, there are several sites that offer free math online. This is a great way for your child to practice multiplication exercise and have fun at the same time.