Calculator Cards provides practice in using a hand-held calculator to solve riddles and math challenges. Students recall general knowledge in a broad range of subject areas and use a variety of math processes as they work through the steps to answer the riddles. The cards require students to: use the operation keys on a hand-held calculator use knowledge of fractions, measurement, and other math concepts recall facts involving number amounts, such as minutes in an hour recall general information involving numbers, such as the number of U.S. states