Here is a small math center that has kids working with three digit numbers in addition and subtraction. All of the problems require regrouping.
The work in this packet is geared towards 2nd graders, but can be used for students in higher grades in need of remediation.
16 Addition Problems: with cards and recording sheet
16 Subtraction Problems: with cards and recording sheet
Four Worksheets w/16 problems each. Answer Keys included