Real answer, he's my child and he inherited my affinity for numbers....Neffie didn't.....I hate it because I have to teach her math in the backwards way the school teaches her for her to get it. Buddy is on a whole nuther' level.....He learned how to multiply by 2s, then I taught him 9s.....He picked it up in like 3 days. Neffie still aced it but I hate how she equates.