Lesson 3

Button Sizer

Est. Class Sessions: 1–2
X

Mathematical Standards

2.OA.A
Represent and solve problems involving addition and subtraction. (2.OA.A.1)
2.G.A
Reason with shapes and their attributes. (2.G.A.1)
2.MD.D
Represent and interpret data. (2.MD.D.10)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in
solving them.
MP2.
Reason quantitatively.
MP3.
Construct viable arguments and critique the reasoning of others.
MP4.
Model with mathematics.
MP5.
Use appropriate tools strategically.
MP7.
Look for and make use of structure.

Students collect, record, and graph data while they measure the size of buttons. Pairs of students sort a handful of buttons by size and then decide how to record their data in a table and on a bar graph.

Content in this Lesson

  • Representing addition and subtraction problems using counters, number lines, drawings, and number sentences [E6].
  • Solving word problems (e.g., join, separate/take away, part-whole, compare) involving two whole numbers whose sum is within 100 [E7].
  • Sorting and classifying objects by their characteristics [E8].
  • Collecting and organizing data in a data table and bar graph [E9].
  • Using a table or bar graph to solve problems about a data set [E10].
  • Knowing what is important to solve a problem [MPE1].
  • Finding a strategy for solving a problem [MPE2].
  • Showing how to solve a problem [MPE5].
  • Using labels to show what numbers mean [MPE6].

Daily Practice and Problems I–J

I. Hidden Buttons

J. Coin Jar

X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Student Pairs

clear plastic bag with an assortment of buttons from Lesson 2
40 connecting cubes

Materials for the Teacher

Display of Button Sizer Data Table and Graph sections (Student Activity Book) Pages 77–79
Display of Math Practices (Student Activity Book) Reference
Display of Mrs. Cook’s Buttons Master (Teacher Guide) Page 92, optional
Display of Button Word Problems Master (Teacher Guide) optional
Unit 2 Assessment Record
class number line (0–100) or the prepared Number Line Display Masters from Lesson 1
clear plastic bag with an assortment of buttons from Lesson 2

Materials Preparation

Prepare Bags of Buttons. Use the clear plastic bags of buttons you prepared for Lesson 2. For this lesson, each student pair will only need about one handful of buttons (about 50 buttons).

Prepare Word Problems for Optional Targeted Practice. Place copies of the Button Word Problems Masters in a learning center for students having trouble with solving word problems (e.g., join/start unknown, join/change unknown).

Assessment in this Lesson

ASSESSMENT EXPECTATION ASSESSED MATH PRACTICES EXPECTATION ASSESSED
Button Sizer
Data Table and Graph
Student Activity Book
Pages 77–82
E8.
Sort and classify objects by their characteristics.
E9.
Collect and organize data in a data table and bar graph.
Mrs. Baker’s Buttons
with Feedback Box
Student Activity Book
Pages 83–86
E6.
Represent addition and subtraction problems using counters, number lines, ten frames, drawings, and number sentences.
E7.
Solve word problems (e.g., join, separate/take away, part-whole, compare) involving two whole numbers whose sum is within 100.
E10.
Use a table or bar graph to solve problems about a data set.
MPE1.
Know the problem. I read the problem carefully. I know the questions to answer and what information is important.
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.

Vocabulary in this Lesson