I have had many problems with my kids and the way the school teaches math... on a couple of occasions I have instructed them on the way I learned it and know it and told them to do it that way regardless of what the teacher tries to teach them, if there's a problem with that I'll gladly meet...
could be factoring, except for that damn 1 5 = 5x1 10 = 5x2 15 = 5x3 so we have 1, 2, 3 25 = 5x5x1 50 = 5x5x2 then 75 = 5x5x3 This better not be some sick april fools joke.