For the snarky teacher with forgetful students-- a subtle homework reminder poster: “Every time you forget your homework, a kitten dies.” Best for older students who can take a joke. Definitely don’t want to traumatize small children.
Three part poster set for multiplying and dividing integers. My students actually requested this to help them remember the rules. For the triangle, you cover the two signs you are multiplying or dividing, and the uncovered one will be the sign for