Does anyone remember watching this math video in school?

Our teacher used to make us watch this math video every Friday. All I remember about the premise is that there are some kids in an abandoned school doing math problems. I somewhat remember it having a "haunting" theme...like parts of it were supposed to be scary, but they really weren't. I also remember the creepy janitor for some reason. Specifically, I remember in the opening, it played "Red Right Hand" by Nick Cave and the Bad Seeds. Can anybody tell me the name of this video series?