Lesson 2

The Pet Shop

Est. Class Sessions: 2
X

Mathematical Standards

1.NBT.A
Extend the counting sequence. (1.NBT.A.1)
1.OA.A
Represent and solve problems involving addition and subtraction. (1.OA.A.1, 1.OA.A.2)
1.OA.C
Add and subtract within 20. (1.OA.C.5, 1.OA.C.6)
1.OA.D
Work with addition and subtraction equations. (1.OA.D.7)

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.
MP6.
Attend to precision.

A pet shop provides students the opportunity to discuss and solve addition problems. The part-whole concept and related language are discussed. Both parts are known and added to find the whole amount. Students are introduced to using calculators as problem-solving tools used to check whether their answers to addtions problems are reasonable.

Content in this Lesson

  • Connecting mathematics to real-world situations: creating and solving word problems about pets.
  • Representing addition situations with stories, diagrams, and number sentences [E7].
  • Solving addition word problems involving two whole numbers whose sum is less than or equal to 30 using tools (e.g., counters, number lines, calculators, diagrams, ten frames) [E6, MPE2].
  • Composing and decomposing numbers using cubes, drawings, ten frames, number lines, diagrams, and number sentences [E1].
  • Connecting representations of quantities [E4].
  • Communicating mathematics orally and in writing.
  • Exploring the calculator as one tool for calculation to determine the reasonableness of a solution and to check calculations [MPE3, MPE4].
  • Solving addition problems using the counting-on strategy [E5].
  • Using labels to show what numbers mean [MPE6]
X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

connecting cubes or counters
desk number line 0–40
calculator

Materials for the Teacher

Display of Animals in the Pet Shop (Adventure Book)
Display of Math Practices (Student Activity Book) Reference
Unit 4 Assessment Record
chart paper
Rooster's Off to See the World by Eric Carle, optional

Materials Preparation

Ten Frames. Make one copy per student of the Ten Frames Master so that they are readily available as a tool when students are solving addition problems.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed
DPP Item C
Is it Even or Odd?
Teacher Guide - digital
E2. 
Identify even and odd quantities using groups of two and groups of two with a leftover.
Rooster's Addition Story
with Feedback Box Teacher Guide - digital
E1. 
Compose and decompose numbers 1–20 using counters, drawings, ten frames, number lines, diagrams, and number sentences.
E6. 
Solve addition word problems (e.g., adding to, putting together, comparing) involving two or three whole numbers whose sum is less than or equal to 30 using tools (e.g., counters, number lines, calculators, diagrams, ten frames, calendars).
E7 
Represent addition situations with stories, drawings, diagrams, counters, number lines, and number sentences.
MPE6. 
Use labels. I use labels to show what numbers mean.