Intriguing math practice pages that reinforce skills in place value, odd and even numbers, addition and subtraction, and multiplication and division facts. Students solve problems and then use a key to color and reveal a mystery picture. Riddle clues on each page add to the fun! Unique and intriguing mystery format engages all learners. Self-checking activities encourage independent practice. Gives students the repeated math practice they need. Meets NCTM Standards!.