This is great to use for two step word problems. The student shades a part of the circle each time they use it. This is to help them create a two step word problem that they can solve.
I used it because my class was struggling with 3.OA.8 with all four operations. The rules were they have to do Multiplication or Division for one step and Addition or Subtraction for the other step. They had to choose two different numbers as well.
The kids loved it! Because it was able to let them choose their own problem to solve.