Fractions and Decimals
Est. Class Sessions: 1–2Summarizing the Lesson
Display the Good Sports Master. This Master shows the survey data Lee Yah and Janet collected at the start of the lesson in a table and as a circle graph. Discuss the strategies students used to solve the problems in Question 23.
Ask:
Write the following equations on the board:
Ask students to show how to solve each problem. See Figure 3 for some possible strategies.
- Which problems did you solve using the hundredths circle? (Possible response: I used the hundredths circle for the problems that had denominators that are factors of 20.)
- Can I show sixteenths on the hundredths circle? (Not easily. I can estimate but the circle is not marked that way.)
- How can I use multiplication and division to change 8/16 to hundredths? (I know 8 × 2 = 16. 50 × 2 = 100.)
- How can you use the hundredths circle to change 6/22 to hundredths? (Possible response: I cannot use it because the circle is not partitioned into 22nds.)
- Can you get an estimate? (Yes. 6/22 is close to 6/20 and 6/20 = 30/100.)
- Who would like to show how to use multiplication and division to solve
? (See Figure 3.) - Do you think you can use a similar strategy to change 6/22 to hundredths? (See Figure 3.)
- What is different? (Possible response: When I divide the denominators I do not get a whole number.)
Write the following on the board:
Ask:
