In addition to solving problems by finding the sum/ difference of the columns in a ratio table, they use the notion of unit rate as a strategy to find solutions to problems involving proportions.
What to look forBe sure that students pay attention to the units or labels in setting up and working the problems. Ratios only make sense in context and the units involved in the context are important in setting up a ratio and interpreting any equivalent ratio.
A car can travel 250 miles on 6 gallons of gasoline. How far can it travel on 9 gallons?
Answer: 375 miles.