Lesson 3

Button Sizer

Est. Class Sessions: 1–2

Summarizing the Lesson

Ask students to refer to the display of Math Practices in the Student Activity Book Reference section as you discuss the following problem:

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  • Sara had some large buttons. She lost 2 buttons. Now she has 4 buttons. How many buttons did Sara have at first?

Ask:

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  • Look at Math Practice 1. What is the question and what information is important? (Possible response: We know Sara lost 2 buttons and now she has 4, but we don’t know how many she started with.)
  • Look at Math Practice 2. What strategy might you use to solve this problem? (Possible response: If I add the buttons she has now to the buttons she lost, I would know how many she had at the beginning. I would count up on the number line.)
  • Look at Math Practice 5. What do you need to include in your work? (Possible response: I would show the hops on the number line and a number sentence.)
  • Look at Math Practice 6. How should you label the numbers in your solution? (All the numbers describe buttons. I might also label the number she started with, the number she lost; for example:   buttons – 2 buttons lost = 4 buttons.)

Assign the Mrs. Baker’s Buttons pages in the Student Activity Book. Have connecting cubes readily available. Explain to students that they will also be assessed on the Math Practices that you discussed during the lesson.

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Use the Mrs. Baker’s Buttons pages with the Feedback Box in the Student Activity Book to assess students’ abilities to represent addition and subtraction problems using counters, number lines, ten frames, drawings, and number sentences [E6]; solve word problems (e.g., join, separate/take away, part-whole, compare) involving two whole numbers whose sum is within 100 [E7]; use a table or bar graph to solve problems about a data set [E10]; know what is important to solve a problem [MPE1]; find a strategy for solving a problem [MPE2]; show how to solve a problem [MPE5]; and use labels to show what numbers mean [MPE6].

Place copies of the Button Word Problems Assessment Master in the Teacher Guide in a learning center to provide targeted practice with different types of word problems (e.g., join/change unknown, join/start unknown) [E7]. Questions 1, 3, and 4 are join problems with the change unknown and Questions 2, 5, and 6 are join problems with the start unknown.

Adventure Book:
Student Activity Book: 83 85 86
Answers
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SAB_Mini
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SAB_Mini
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SAB_Mini
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Master: