Need the perfect, ready-to-go 3 digit subtraction with regrouping using the box it method activities? Grab these 3 digit subtraction activities for 2nd, 3rd or 4th grade students, including: subtracting from groups of 100 lesson plan, warm up, turn & talk, instructional video, anchor charts, learning target, and practice worksheet. This includes ONE addition and subtraction activity that is a part of a bigger Adding and Subtracting to 1000 Unit Bundle!3 Digit Subtraction using the Box It Met