Lesson 1

500 Hats

Est. Class Sessions: 2
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Mathematical Standards

3.NBT.A
Use place value understanding and properties of operations to perform multi-digit arithmetic. (3.NBT.A.2)

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.

The 500 Hats of Bartholomew Cubbins by Dr. Seuss provides a context for the continued development of students' own addition strategies with multidigit numbers. Students partition, add, and subtract two- and three-digit numbers using mental math strategies. They use number lines and expanded form to help visualize the partitions and operations.

Content in this Lesson

  • Showing that different partitions of the same number are equal using base-ten pieces and number lines [E1].
  • Representing and solving addition problems using number lines [E2].
  • Adding and subtracting multidigit numbers using mental math strategies or paper-and-pencil methods [E3, E4].
  • Choosing appropriate addition strategies.
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide
  • 500 Hats
    Check-In:
    Question 11
    Page 127
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Materials for Students

desk number lines (0–100)

Materials for Teachers

The 500 Hats of Bartholomew Cubbins by Dr. Seuss or another story that refers to numbers in the hundreds, optional
Unit 6 Assessment Record
Math Facts Class Record
class number line (0–130)
chart paper, optional

Materials Preparation

Subtraction Flash Cards. Students have received and prepared Subtraction Flash Cards in Units 2–5. If needed, prepare copies on heavier paper or card stock. Have students cut apart the sets they need and store them in an envelope.

Assessment in this Lesson

Assessment Expectation Assessed

500 Hats
Check-In: Question 11
Student Guide
Page 127
E2.
Represent and solve addition problems using base-ten pieces and number lines.
E3.
Add multidigit numbers using mental math strategies (e.g., composing and decomposing numbers and counting on).
E4.
Add multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, and compact).

Use Tens and Ones
Check-In: Questions 3–5 with Feedback Box
Student Activity Book
Pages 173–174
E1.
Use and apply place value concepts to make connections among representations of numbers to the thousands using base-ten pieces, number lines, expanded form, and standard form.
E2.
Represent and solve addition problems using base-ten pieces and number lines.
E3.
Add multidigit numbers using mental math strategies (e.g., composing and decomposing numbers and counting on).
E4.
Add multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, and compact).

DPP Item A
Subtraction Flash Cards: All Groups
Online Teacher Guide
E6.
Use mental math strategies to subtract for the facts in all groups.

Vocabulary in this Lesson