These are self-checking practice pages that are common core aligned. To check their answers, students simply plug the answers into a riddle. If the answer makes sense, their answers are right! Each page includes computation and most include word problems. It includes complete keys and is aligned with Envision Unit 9 for 5th grade. This unit includes equivalent fractions, fractions in simplest form, estimating sums and differences of fractions, least common multiples, finding common denominators, adding fractions with unlike denominators, and subtracting fractions with unlike denominators. Examples and ample work space are provided in a kid-friendly appealing format.