Lesson 7

Using Number Sense at the Book Sale

Est. Class Sessions: 1

Summarizing the Lesson

Share Solution Strategies. After students have finished solving the problems, ask them to share their solution strategies. Two examples of solution strategies are provided.

To solve Question 6, students can use $1.00 as a benchmark number. Each of the books by Beverly Cleary is 95¢. Since this is close to $1.00, students can use doubling to estimate the cost for both books at $2.00. Amazing Grace costs $1.50, so the total cost is estimated at $3.50. Since Carla only has $3.00 she will not be able to buy all three books.

Students can count by quarters to solve Question 9. Kim will need four quarters to buy Children of the Fire and three quarters to buy Charlie and the Chocolate Factory. The total for both books will be seven quarters or $1.75. Since Kim has $2.50 students can skip count by quarters from $1.75 to $2.50 to see that Ana will still have three quarters left. She can purchase three Little House books since they are four for $1.00, or 25¢ each.

Students will create their own problems involving changing money at the bookstore in Question 10. After they have written their problem, have them swap problems with a partner. After students have solved each other's problems, they can check each other's solutions and strategies. This problem can also be assigned as homework.

Ask students to complete Check-In: Question 11 in the Student Guide. Remind them to use the Math Practices previously discussed to guide their written work.

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Use Check-In: Question 11 in the Student Guide and the corresponding Feedback Box in the Teacher Guide to assess students' abilities to:

MPE2.
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.
MPE6.
Use labels. I use labels to show what numbers mean.

Peer or Self-Assessment. Ask students to review a partner's work or ask students to review their own work using the Student-to-Student section of the Using Number Sense at the Booksale Check-In: Question 11 Feedback Box Assessment Master. You can ask students to revise their work using a different color pencil based on their self-assessment or peer review.

Student Guide:
Student Activity Book:
Master: