Need your students to improve or practice their calculator skills with fractions including mixed numbers and improper fractions? Try this! All of my riddles (including this one) are designed with TI-15 Calculators in mind, but you can tweak it to work with any scientific calculator that has numerator, denominator, mixed number, and conversion keys. I structure the document so that the students feel as though they are solving riddles instead of just completing a worksheet. You can have them work in pairs or independently, but by the end of the activity I can promise this will give you a better idea of what your students may need more help in while also giving you teachable moments to give timely feedback.