Lesson 2

Partition Shapes

Est. Class Sessions: 2–3
X

Mathematical Standards

2.G.A
Reason with shapes and their attributes. (2.G.A.3)

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.
MP7.
Look for and make use of structure.

Students use pattern blocks to partition shapes into halves, thirds, fourths, sixths, and eighths. They explore the concept of a unit whole and identify the fractional part when given the whole. Students learn that the same fractional parts of different-size wholes are not equal.

Content in this Lesson

  • Using pattern blocks to partition shapes into equal shares (e.g., halves, thirds, fourths, sixths, eighths) [E2].
  • Using words and models to describe equal shares (e.g., half, half of) [E4].
  • Recognizing that the same fractional parts of different-size unit wholes are not equal [E7].
  • Finding a strategy [MPE2].
  • Checking for reasonableness [MPE3].
  • Communicating solution strategies [MPE5].
X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

set of pattern blocks (4 yellow hexagons, 24 green triangles, 16 brown trapezoids, 12 blue rhombuses, 8 red trapezoids).
    See Materials Preparation.
crayons or colored pencils
paper
scissors
resealable plastic bag, optional

Materials for the Teacher

Display Questions 5–7 of Parts and Wholes (Student Activity Book) Page 644
Unit 13 Assessment Record
Math Facts Class Record
Display set of pattern blocks
crayons or colored pencils, optional
scissors, optional
gluestick, optional

Materials Preparation

Prepare Pattern Block Sets. Organize pattern blocks into sets and place each set into a resealable plastic bag. Each set will contain 4 yellow hexagons, 24 green triangles, 16 brown trapezoids, 12 blue rhombuses, and 8 red trapezoids. See Figure 1.

image

Figure 1: Pattern block names

Prepare Optional Targeted Practice. Make copies of the Fold and Color Halves Assessment Masters and the Fold and Color Fourths Assessment Masters. Make sure you do not copy the pages back-to-back so that students can cut out the shapes on the first page of each set. Place them in a center with scissors, colored pencils or crayons, and a gluestick.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed
Show Part of the Whole
Check-In: Questions 1–3
with Feedback Box
Student Activity Book
Pages 647–648, 651
E2. 
Partition shapes and sets into equal shares.
E4. 
Use words and models to describe equal shares (e.g., half, half of).
E7. 
Recognize that the same fractional parts of different-size unit wholes are not equal.
MPE3. 
Check for reasonableness. I look back at my solution to see if my answer makes sense. If it does not, I try again.
MPE5. 
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.
Mrs. Murphy's Party Cake
Student Activity Book
Page 653
E2. 
Partition shapes and sets into equal shares.
E4. 
Use words and models to describe equal shares (e.g., half, half of).
DPP Item G
How Many More
Teacher Guide - digital
E10. 
Demonstrate fluency with the subtraction facts related to the addition facts in Group E (11 − 1, 11 − 10, 12 − 2, 12 − 3, 12 − 4, 12 − 5, 12 − 7, 12 − 8, 12 − 9, 12 − 10, 13 − 3, 13 − 4, 13 − 5, 13 − 8, 13 − 9, 13 − 10, 14 − 5, 14 − 9).
DPP Item H
Becky's Strategy
Teacher Guide - digital
E10. 
Demonstrate fluency with the subtraction facts related to the addition facts in Group E (11 − 1, 11 − 10, 12 − 2, 12 − 3, 12 − 4, 12 − 5, 12 − 7, 12 − 8, 12 − 9, 12 − 10, 13 − 3, 13 − 4, 13 − 5, 13 − 8, 13 − 9, 13 − 10, 14 − 5, 14 − 9).