5.7 Similarity
Ratios and Proportions
I.SectionObjectives
- Write and simplify ratios.
- Formulate proportions.
- Use ratios and proportions in problem solving.
II.ProblemSolvingActivity-Ratio/ProportionRelay
- Since this lesson is mostly review, use this fun game to review the concepts in the lesson.
- To prepare, bring in a bunch of assorted items from home. Make these random household items, but have
more than one of each type of items. For example, three hairbrushes or five apples. - Then put the students are four teams.
- This activity is timed.
- Students come up one at a time.
- Students have 15−20 seconds to look at the table and write as many ratios as they can.
- Then buzz it and the next person comes up.
- The last person has to take the ratios of the first three and create as many proportions as he/she can in two
minutes. - Students are not allowed to coach each other in their work.
- The team with the most ratios earns points.
- The team with the most correct proportions wins.
- You can repeat this more than once. Students will love it.
III.MeetingObjectives
- Students will write and simplify ratios.
- Students will write proportions.
- Students will use ratios and proportions in problem solving.
IV.NotesonAssessment
- How many ratios did each team write?
- Are the proportions accurate?
- Assess the time constraints, did the students need more or less time- adjust as necessary.
Properties of Proportions
I.SectionObjectives
Chapter 5. Geometry TE - Problem Solving