Need a fun math center, task, worksheet, or warm-up? Do you have early finishers that are bored and unchallenged? These number riddles are the answer! They challenge students to apply several different concepts and promote flexible thinking and number sense. They are also leveled, so it is easy to DIFFERENTIATE! There are 7 levels (A-G). There is also a blank sheet provided to write in your own number riddles. Even better, the answer key is included! Keep Calm and Love Math!