Lesson 4

Zoo Sticker Arrays

Est. Class Sessions: 2
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Mathematical Standards

2.OA.A
Represent and solve problems involving addition and subtraction. (2.OA.A.1)
2.OA.B
Add and subtract within 20. (2.OA.B.2)
2.OA.C
Work with equal groups of objects to gain foundations for multiplication. (2.OA.C.4)
2.G.A
Reason with shapes and their attributes. (2.G.A.2)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in
solving them.
MP2.
Reason quantitatively.
MP4.
Model with mathematics.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.
MP7.
Look for and make use of structure.
MP8.
Look for and express regularity in repeated reasoning.

Students learn how to represent repeated addition and multiplication problems with rectangular arrays and number sentences. They develop strategies for solving multistep multiplication problems.

Content in this Lesson

  • Representing multiplication problems using tiles, drawings, number lines, rectangular arrays, and number sentences [E2].
  • Solving multiplication problems using strategies (e.g., skip counting, repeated addition) with tiles, drawings, number lines, rectangular arrays, and number sentences [E7].
  • Knowing what is important to solve a problem [MPE1].
  • Finding an efficient strategy for solving a problem [MPE2].
  • Checking for reasonableness [MPE3].
  • Showing or telling how to solve a problem [MPE5].
  • Using labels to show what numbers mean [MPE6].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

20 square-inch tiles

Materials for the Teacher

Display of Zoo Stickers (Student Activity Book) Pages 615–616
Display of Cost of Zoo Stickers (Student Activity Book) Page 618
Display of Math Practices (Student Activity Book) Reference
Unit 12 Assessment Record
Math Facts Class Record
30 square-inch tiles
chart paper. See Materials Preparation.

Materials Preparation

Prepare Chart for Multistep Problem Solving. Use chart paper to create a chart with the title “Strategies for Knowing the Problem.”

Assessment in this Lesson

ASSESSMENT EXPECTATION ASSESSED MATH PRACTICES EXPECTATION ASSESSED
Problems with Zoo Stickers
with Feedback Box
Student Activity Book
Pages 619–622
E2.
Represent multiplication and division problems using tiles, drawings, number lines, rectangular arrays, and number sentences.
E7.
Solve multiplication and division problems using strategies (e.g., skip counting, repeated addition) with tiles, drawings, number lines, rectangular arrays, and number sentences.
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.
DPP Item L
Word Problems
Teacher Guide - digital
E10.
Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Group D.

Vocabulary in this Lesson