Mr. Math notices that a group of students are struggling with two step word problems. Students were given a practice problem after modeling and working with base ten blocks for over a week. The students were able to explain their thinking and solve the problem with base ten blocks. However, when Mr. Math gave the same problem on paper, the students could not solve it. What can Mr. Math do to ensure students are grasping the concept of solving two step problems and being able to show their work?