This is a game for unit 1 lesson 5 in Expressions Math (specifically the on level activity for differentiated instruction). I will put these in a sheet protector and have students play in pairs. One student will shake and spill 4 counters, then they will both record on their partner train. If the partners have already been used, they loose their turn and continue until the train is filled. The partners should be 1+3, 2+2, and 3+1...not necessarily in that order. When the train is full, they each erase their partner train and play again. Expressions wants students to see the partners several times to grasp the number partners of 4.