Lesson 3

Boo the Blob

Est. Class Sessions: 1
X

Mathematical Standards

3.MD.C
Geometric measurement: understand concepts of area and relate area to multiplication and to addition. (3.MD.C.5, 3.MD.C.6)

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.

Students find the area of a “blob” named Boo. Boo can change shape but not area. In this context, students investigate the relationship between shape and area and estimate the area of irregular shapes. They also learn to find the median value of data.

Content in this Lesson

  • Measuring area by counting whole and fractional parts of square centimeters [E3].
  • Finding the area of shapes with straight and curvy sides [E3].
  • Investigating the relationship between shape and area [E1].
  • Recognizing that different shapes can have the same area [E1].
  • Averaging: finding the median [E7].

Daily Practice and Problems G–H

G. The Hour Hand

H. How Long Does It Take?

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

6 square-inch tiles

Materials for the Teacher

Display of Boo the Blob page (Student Guide) Page 101
Display of Math Practices (Student Guide) Reference
Unit 5 Assessment Record
6 square-inch tiles
self-adhesive notes or index cards, optional

Materials Preparation

Prepare Name the Blob pages for a Learning Center. Copy the Name the Blob pages from the Student Activity Book and place them in a learning center.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed

Boo the Blob Changes Shape
Check-In: Questions 5–9
with Feedback Box
Student Activity Book
Pages 154–155
E1.
Recognize that different shapes can have the same area.
E3.
Find the area of shapes with straight or curved sides by counting square units.
E7.
Find the median of a data set.
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.

Vocabulary in this Lesson