Lesson Plan
Ratios: Interpreting the Phrase "Out Of"
Subject
Math, Science & Technology
Grade Levels
Intermediate, 5th Grade, 6th Grade
What is a Ratio? Worksheet
This worksheet should be completed during class time. The front side gives students some review practice in the three forms of writing a ratio and asks them to deduce missing information from given information. It emphasizes the concept of order when writing ratio. #5 and #6 on the back of the worksheet should be comleted while watching the PowerPoint. #7, 8 and 9 should be done by students independently or while working with partners.
PowerPoint: What is a Ratio?
The PowerPoint is meant to reintroduce students to the major concepts behind ratio. The teacher must control the presentation and should view it ahead of time. The teacher is expected to narrate the images shown on the screen. At one point, a link is shown on the screen to www.tridentgum.com. Clicking on this link provides an automatic link to the website. Trident Gum has created a very graphic, easily understood representation of the phrase "out of". They, of course, relate it to "4 out of 5 dentists recommend sugarless gum . . .". It is a funny and effective presentation! Return to the PowerPoint presentation as it guides students through #5 and #6 on the worksheet.
Ratio using out of
Description
This lesson was designed to reintroduce the concept of ratio to an 8th grade mathematics class. It is composed of a PowerPoint demonstration with a link to the website of Trident Gum that provides a perfect illustration of how to interpret the phrase "out of" in a word problem. The lesson also includes a worksheet that provides problems for students to complete for practice during class.
Website(s)
Trident Gum
Special Note
Although the description references a connection to the 8th grade math curriculum, New York State has updated the math standards, including when some content, such as ratios are is covered. Thus, NYLearns.org team revised this lesson to include this new information and modified it for grades 5 and 6 where the introduction of ratios are now covered based on the new 2005 math standards.
