This no prep subtract and graph math center is a great math activity for first or second grade! Students can practice subtraction and graphing skills at the same time while having fun. Color and black and white versions are available. Directions:1. Students start with an assigned number either 12, 13, 14, 15, 16, 17, 18, 19, or 20. (All worksheets are included in this packet for these numbers.) 2. They roll the die, find the difference from their assigned number, and make tally marks in a t