Percents Greater Than 100

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Objective

SWBAT estimate using percents greater than 100%.

Big Idea

What is the difference between 150% and ½%? Is there a difference? Really?

Launch

5 minutes
  • POD

As students enter the room, they will have a seat, take out their Problem of the Day (POD) sheet and begin to work on the question on the SMARTboard. The POD allows students to use MP 3 continually based on the discussions we have about the problem each day.

Since we have worked with estimating percents, we are going to begin working with percents greater than 100%.  I want students to start by thinking of concepts we have already covered. Having them spend time thinking about possibilities for percents greater than 100% sets a good foundation for the activity during class today. We can discuss the differences between percents greater than and less than 100% to frame our classwork.

When might you need to round to the nearest 100%?

Explore

30 minutes

We will take notes and work through practice examples together as a class to establish some foundation and a level of comfort for estimation before we begin to work individually or in groups. I want to make sure that I have an opportunity to address any misconceptions that might arise. Working with percents greater than 100 sometimes causes students some confusion. They are not always ready for the idea that percents greater than 100 result in a number larger than the original number. I want to make sure we can address that as a group before habits are formed incorrectly.

Landing

5 minutes

To end the class, students will respond to an exit ticket that will serve as a formative assessment for what we did in class today. I want to gauge how comfortable students are with working with smaller percents. If we have a percent that is not as common as 50% or 10%, are they comfortable with making estimations? Using the responses, I can choose an approach to use as a My Favorite No to begin the next class.

Find about 1.4% of 25. Tell what steps you used to find the answer. Describe a situation when you might need to find an estimate for 1.4% of 25.