This Problem Set is part of the the Lesson 18, Unit 5, Grade 5. In #1, what is the relationship between (a) and (b), (c) and (d), and (b) and (c)? Why is the quotient of #1(c) greater than that of #1(d)? Is it reasonable? In #4, the values were too big to draw a model. So, how did you solve? Look at #6. What did your diagram look like? Did anyone draw an area model? Why does that work? Can we write a multiplication sentence to represent this situation?