Ratio

1
Ratio Proportion

• Sue Cheung
• ETEC 442
• 6/23/05

2
Audience

• Learners
• 8th Grade
• Pre-Algebra Class
• Average Math Skills

• Duration
• 2 1-hr sessions

3
Lesson Objectives
Students in the 8th Grade Pre-Algebra Class will
be able to

• Derive the proper ratios and proportions from
  given descriptions with 80 accuracy
• Complete problems involving ratios and
  proportions with 80 accuracy
• Complete individual worksheet with 80 accuracy
• Complete group activity with 80 accuracy

4
HCPS II Mathematics Content Standards

• Number and Operations Grade Cluster Benchmarks
  (6-8)
• Recognize and use signed numbers (e.g., order and
  compare integers and rationals), proportions, and
  percents
• Select and use appropriate strategies for
  computing with rationals, ratios,
• exponents, square roots

• Measurement Grade Cluster Benchmarks (6-8)
• Use ratios and proportions to solve problems
  related to measurement

5
HCPS II Educational Technology Content Standards

• Technology as a tool and productivity
• Students use technology tools to enhance
  learning, increase productivity, and promote
  creativity. Students use productivity tools to
  collaborate in constructing technology-enhanced
  models, preparing publications, and producing
  other creative works
• Technology as a tool for research
• Students use technology to locate, evaluate, and
  collect information from a variety of sources.
  Students use technology tools to process data and
  report results. Students evaluate and select new
  information resources and technological
  innovations based on the appropriateness to
  specific tasks

6
Lesson Introduction

• Importance of Ratio Proportion in everyday life

• Grocery Shopping

• Painting Project

• Chemistry Project

• Cooking Recipe

7
Lesson Introduction

• Show a video clip of DIY (Do It Yourself) expert
  Craig Phillips on mix paint using ratio via the
  internet

8
Instructional Activity

• Teacher shows practical application through
  guided practice

• Students will practice solving for ratio and
  proportion via an online activity

• Students to work on Ratio Proportion worksheet
  individually

9
Instructional Activity

• Students to bring dolls and action figures on the
  next day for extra credit
• Students to work on activity How Big Is Barbie?
  in a group of 3-4 people

10
Lesson Closure

• Students will share their group results for
  activity How Big Is Barbie? with the class

• Students will use the Group Work Rubric to
  evaluate each group member

11
Follow Up Activity

• For Extra Credit
• Option 1 Students to take measurement of
  themselves and scale them backwards to determine
  the dimensions of a doll modeled after them
• Option 2 Using the measurements in one of the
  data charts as the average male or female,
  scale the measurements backwards to determine the
  dimensions of a 12-inch doll with proportional
  measurements

12
Lesson Assessment

• Teacher to use Rubric to evaluate Ratio
  Proportion worksheet
• Teacher to use Rubric to evaluate group activity
  How Big Is Barbie?
• Students to use Group Work Rubric to rate each
  group member
• Teacher to observe students behavior and
  participation in the group activity

13
Teaching Resources

• Website http//www.bbc.co.uk/skillswise/numbers/w
  holenumbers/ratioandproportion/ratio/
• Ratio Proportion worksheet
• An assortment of Barbie dolls and action figures
  (Batman, G.I. Joe, Power Ranger etc)
• Student Handout on How Big Is Barbie?

14
Teaching Resources

• Data Charts for group activity
• Measuring Tapes
• Calculators
• Desktop Computer with internet access
• Projector and Overhead Screen
• Copies of the Group Work Rubric for student
  evaluation

15
The End