On the first day of school in 3rd grade, our math teacher handed out our math workbooks. These books had a series of lessons to last the whole year, with a several-page answer section in the back. The teacher made us rip out the answers and throw them away so we’d actually have to do the work.
One day a little ways into the school year, I lost my math book. Not on purpose, just lost it somehow. So the teacher tells me to get a replacement book out of the cabinet. However, she forgot to tell me to hand over the answers section, and of course I wasn’t going to volunteer to do so.
So for the rest of the year, I had the answers too all the homework problems, and math class was a breeze.
That's some hard winning for a 9 year old.