Lesson 5

Explore Circumference and Diameter

Est. Class Sessions: 4

Daily Practice and Problems

Teacher Notes
X

TIMS Task

  2. A–C.
    1. 16 hours
    2. 40 hours
    3. Ratios will vary. One possible ratio is 4 hours/1 bottle
    4. Two possible ratios are: 8 hours/2 bottles and 12 hours/3 bottles

Ongoing Assessment

Use Task X to assess students' abilities to represent [E1, E2], find equivalent [E3], and use ratios and proportions to solve problems [E4].

X. Recycle Problem Solving

You will need a piece of Centimeter Grid Paper to complete this problem.

Luis and Jerome discovered an interesting fact while studying recycling. The energy saved from recycling one glass bottle will light a 100-watt bulb for four hours.

  1. Use this fact to complete the data table.

    1. Make a graph comparing the (N) Number of Recycled Glass Bottles to (T) Time a 100-watt bulb can burn.
    2. How many hours can a 100-watt bulb burn from the energy saved from 4 recycled glass bottles? Show your work on your graph.
    3. If you recycled 10 glass bottles, how many hours can a 100-watt bulb burn with the energy saved? Show or tell how you solved this.
    4. Write a ratio that compares Time to Number of class bottles.
    5. Write two ratios equivalent to the ratio in Question 2D.