geoff: for blair keeley's students, things are starting to add up. even if it means singing the subject. back to themselves. >> she's the best. the best teacher i have ever had in math. geoff: teaching 7th grade at greer middle, where she went to school, and dreaded math. >> my mother actually used to say, "are you really a math teacher?" because she saw me through the struggles. geoff: so having her students create a factor tree, >> you are going to take your scissors, and you are going to cut from the fold. geoff: was never part of her long-term plan. she was always going to be an elementary school teacher, until she fell in love with teaching math to 5th graders, because she could relate so well to their struggles. >> i do a lot of trying to explain to them why we do the things we do, because through my math journey, i didn't know why i was doing it. and i'm sure teachchs told me, i just didn't get it. geoff: ms. keeley's students are getting it, in this case with the help of james madison, thomas jefferson, and other former presidents, to help so