回复：Thanks,your Method is right for tutoring your son.I think,

Thanks for the suggestion. Most of kids like math because to them math is a fun game. But few kids can or are willing to reach the next level which is involved in solving abstract math and physics problems, like those mathematicians and physics scientists. But if my kids finally take math as a life time hobby like enjoying music, paintings, or any charming art,  then that would be my best wish.