Students will practice finding the greatest common factor and least common multiple - GCF and LCM - as they gather clues and solve the mystery of the missing key with this math task card mystery! Easy to prep, motivating and engaging for kids, and a fun way to practice! Open the PREVIEW to get a detailed look at this resource! ⭐ What is Included? 26 task cards Teacher directions Student directions Letter to students setting up the mystery Mystery solutions checklist Task card answers recording sheet Certificate for solving the mystery Answer key ⭐ Math Skills Used in This Math Task Card Mystery: Greatest common factor - GCF Least common multiple - LCM GCF and LCM word problems ⭐ Many Ways to Use This Math Task Card Mystery: Whole class activity Small group activity Math centers or stations Enrichment Review activity End of unit wrap up Substitute activity Extension activity ⭐⭐ CLICK HERE to see all of my Math Task Card Mysteries! ⭐⭐ Follow me and be notified when new products are added to my store. New products are always 50% off for the first 24 hours they are posted! Thanks! Dawn - Hello Learning ⭐ Did you know that leaving feedback on your TpT purchases earns you credits that will save you money? Go to your ‘My Purchases’ page and leave feedback on the resources you’ve purchased to earn TPT credits toward future purchases!