I use this in my math workstation. I printed the activity on colored paper and laminated them. Each student in that group is given a dry erase marker, an eraser, and two dice. They roll the dice at the same time and use the results to represent both of their parts, and then they must solve for the whole. You could also choose to give your students one die and have them roll it twice. For your higher achieving students you could buy the small wooden blocks and write numbers between 6-20 on them for a differentiated component.