A rocket climbs the page with stars scattered around it, and fifteen division problems are written across its nose, body, fins and flames. The key sets five colors against five answers, so solving a problem tells a child which crayon the space wants.
Every quotient lands between 2 and 6, which keeps the whole sheet inside the color key and means no child ends up holding an answer with nowhere to put it. Mistakes surface on their own here, because a wrong quotient puts the wrong color in the middle of the rocket and the picture stops looking right. It prints in black and white and uses very little ink, so a class set costs almost nothing.