Looking for a math challenge for your early finishers and 2nd & 3rd grade math centers? Here's an engaging set of critical thinking money math puzzles to develop your students’ skills in counting mixed combinations of US coins. For a closer look at this US coins resource, click the preview button!Here's how these coin combinations riddle cards work!Choosing from a grid of nine numbers on each of the 24 math puzzle cards, your students will determine the secret number by using critical thinki