Lesson 1

T-Shirt Factory Problems

Est. Class Sessions: 1
X

Mathematical Standards

3.OA.A
Represent and solve problems involving multiplication and division. (3.OA.A.3)
3.OA.D
Solve problems involving the four operations, and identify and explain patterns in arithmetic. (3.OA.D.8)

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.
MP6.
Attend to precision.
MP8.
Look for and express regularity in repeated reasoning.

Using the First Names investigation in Unit 1 as a context, students invent, share, and compare strategies used to solve problems involving multiplication.

Content in this Lesson

  • Interpreting bar graphs.
  • Using data from graphs to solve problems.
  • Solving two-step word problems involving multiplication [E4, MPE1, MPE4].
  • Using reasoning and repeated addition to solve multiplication problems [E3].
  • Communicating reasoning and solutions orally and in writing [MPE5].
  • Solving multiplication problems in more than one way.

Daily Practice and Problems A–B

A. Number of Toes

B. Reasoning from Known Facts

X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

connecting cubes or other counters
calculator

Materials for the Teacher

Display of the graph on the T-Shirt Factory Problems page (Student Guide) Page 52
Display of Math Practices page (Student Guide) Reference
Unit 3 Assessment Record

Assessment in this Lesson

Assessment Expectation Assessed Math Practices
Expectation Assessed

T-Shirt Factory Problems
Check-In: Question 8
Student Guide
Page 53
and the corresponding
Feedback Box
Teacher Guide - digital
E3.
Multiply and divide using mental math strategies (e.g., reasoning, repeated addition).
E4.
Solve two-step word problems involving multiplication and division.
MPE1.
Know the problem. I read the problem carefully. I know the questions to answer and what information is important.
MPE4.
Check my calculations. If I make mistakes, I correct them.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.