Lesson 2

Goldilocks and the Three Rectangles

Est. Class Sessions: 1–2
X

Mathematical Standards

1.NBT.A
Extend the counting sequence. (1.NBT.A.1)
1.NBT.B
Understand place value. (1.NBT.B.3)
1.MD.1
Measure lengths indirectly and by iterating length units. (1.MD.A.1, 1.MD.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.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.

In this lesson, students continue to explore different aspects of size among two-dimensional figures. They begin by listening to an extension of the story “Goldilocks and the Three Bears.” Then they measure the height and width of the story’s three rectangles in inches and their area in square inches.

Content in this Lesson

  • Measuring length in inches [E5].
  • Comparing and ordering quantities (e.g., lengths and areas) [E1].
  • Finding the area of a shape by counting square units [E6].
  • Collecting and organizing data in a table.
  • Recognizing that different shapes can have the same area [E4].
  • Finding an efficient strategy for solving a problem [MPE2].
  • Using labels to explain what numbers mean [MPE6].

Assessment in This Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed
Goldilocks and the Three Rectangles
Check In: Question 4 with Feedback Box Student Activity Book Pages 202–203
E4. 
Recognize that different shapes can have the same area.
E5. 
Measure length in inches.
E6. 
Find the area of a shape by counting square units and nonstandard units using efficient counting strategies.
MPE2. 
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
Rectangle Friends
Student Activity Book Pages 205–206
E1. 
Compare and order quantities (e.g., lengths, areas).
E4. 
Recognize that different shapes can have the same area.
E5. 
Measure length in inches.
E6. 
Find the area of a shape by counting square units and nonstandard units using efficient counting strategies.
MPE6. 
Use labels. I use labels to show what numbers mean.

Daily Practice and Problems C–D

C. At the Circus

D. How Many in the Bag

X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

12-inch ruler
15–20 square-inch tiles

Supplies for Student Pairs

40 square-inch tiles
scissors

Materials for the Teacher

3-5 copies of Rupert Rectangle from Rectangle Friends (Student Activity Book) Page 203
Display of Goldilocks and the Three Rectangles (Student Activity Book) Pages 199–203
Display of Math Practices (Student Activity Book) Reference
Display of the first Rectangle Friends page (Student Activity Book) Page 205
Unit 8 Assessment Record
12-inch ruler for display
square-inch tiles for display, optional

Vocabulary in this Lesson