OK, just for fun: I got a c64 game that I want to see if anyone can name:
It is an educational game, I guess. You are this guy out in the woods with a dog, and there are a bunch of numbers and math symbols hanging from the trees. You whistle to get your dog to come on over, and then he always knocks you on the ground. You in turn need to stomp on your dog's back over and over again to get high enough in the air to pick the numbers from the trees.
There is also a cave filled with monsters with numbers on them. If you have built an equation that matches the number on the monster, you can shoot the monster and he turns into steam. Then you need to run out of the cave where there is a giant vacuum machine. Every time you vacuum a monster steam up, you get to do a happy dance. The more monsters you catch, the more elaborate your happy dance.