Subtracting within 100 with regrouping will help your 2nd graders escape Mars in this engaging double-digit subtraction math activity. In this digital escape room, students will race to subtract 2 digit numbers and solve subtraction word problems requiring regrouping to find a locker combination, a secret item, the location of the rocket, and a launch code. Escape rooms encourage collaboration and active learning. This online escape room can be completed as a whole group activity, or by small gr