> For example, if my son asked "what is 142 + 47?", I would feel better knowing the response explained how he could approach the problem 100 + 80 + 9 = ? I'm

> For example, if my son asked "what is 142 + 47?", I would feel better knowing the response explained how he could approach the problem 100 + 80 + 9 = ? I'm 35 and this is a game changer, my schooling failed my but thanks so much!