A fifth-grade teacher writes the problem 56 ⋅12 on the board. Students begin to solve the problem mentally, and as each student finds a solution, he or she signals the teacher with a thumbs-up signal. When almost every student has given a thumbs-up signal, the teacher has the following dialogue with a student. Teacher: “Billy, what answer did you come up with?” Billy: “792.” Teacher: “Great job, Billy! That is the correct answer. Raise your hand if you found 792 to be the product, like Billy.” Almost every student in the class raised a hand. The teacher writes the next problem on the board. Which instructional adjustments can the teacher make to best assess all of the students’ understanding of multiplying two-digit numbers?