This is a great game to use for adding numbers on one, two or three dice as well as to develop an understanding of the strategy of adding one and subtracting one (one more and one less). The pages can be used individually, in a small center group or to build these skills and strategies for an RTI lesson. Everything is ready to be printed in color for student use. Addition. Strategies of +1 and -1. RTI. Differentiation. Center game.