2.1 and 2.2 Scaling and Using Unit Rates

Lesson Focus: The main goal for this lesson is to look at how to create and use unit rates as a strategy for comparing ratios.

Part 1: Comparing Rates

As a follow-up to our work last class, try to use one of the "comparing ratios" strategies from last class.  If you need a reminder, here is the list that we generated:

• Create a common numerator
• Create a common denominator
• Convert into percentages

Part 2: Creating and Comparing Unit Rates

One way to compare two ratios (or rates) is to make a unit rate by scaling each ratio to find the cost of one pizza.  If you want some additional practice with finding unit rates, you can watch the video below.


Now try to find the unit rate for each of the pizza specials shown below:

When you are ready, try to determine which jar of peanut butter is the "better buy".  Remember to give a reason for your final decision.

Here is what you MUST do before next class:

• ACE (11) p. 54
• "Ratios, Rates, and Unit Rates" on Math XL For School.