Rogue Algorithm

These twelve self-checking riddles are a great resource for classwork, centers, or homework. My kids love doing riddles like these (though I think what they love even more is telling me how corny the jokes are). I, of course, love being able to quickly grade an entire stack of papers! These activity sheets focus on addition and subtraction and allow students to evaluate expressions for the reasonableness of their sums and differences and to calculate sums & differences of multi-digit num