Subtraction Review Math Mystery Activity - Case of The Missing Macaw - 2nd Grade Edition. Engage and motivate your students while they practice and review subtraction skills (no regrouping in any of the questions over 1-20 facts in this mystery). Just print and go, your students will have fun trying to figure who has the Missing Macaw! ⭐Optional Video Hook provided to set the stage to engage! Plus, there's a bonus ending video to wrap up the activity. ⭐ PreparationEasy prep! Just Print, Copy,