Lesson 1

Equal Shares

Est. Class Sessions: 2
X

Mathematical Standards

2.G.A
Reason with shapes and their attributes. (2.G.A.2, 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.
MP4.
Model with mathematics.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.

Students solve problems that require partitioning shapes and sets into equal shares. They share items fairly among two, three, and four people and build understanding of halves, thirds, and fourths.

Content in this Lesson

  • Solving word problems involving partitioning shapes and sets into equal shares [E2].
  • Using words and models to describe equal shares (e.g., half, half of) [E4].
  • Recognizing that equal shares of the same whole do not have to be the same shape [E5].
  • Finding a strategy [MPE2].
  • 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
  • DPP Item A
    Triangle Flash Cards: Group E Subtraction Facts

Supplies for Students

paper
crayons or colored pencils
connecting cubes
scissors
one small rectangular self-adhesive note or an index card

Materials for the Teacher

Display of Share Fairly (Student Activity Book) Pages 635–636
Display of Sharing Sandwiches (Teacher Guide)
Unit 13 Assessment Record
Math Facts Class Record

Materials Preparation

Prepare Optional Shape Models. Have several copies of the Shape Models Master available for students to use if they choose. They can use the rectangle, circle, or square as models when solving problems.

Triangle Flash Cards. Prepare copies of the Triangle Flash Cards on heavier paper or card stock. Have students cut apart each set and store them in an envelope. Provide each student with two sets, one to use at school and one to take home. Students will need these cards on an ongoing basis.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed
Equal Shares
Check-In: Questions 7–9
with Feedback Box
Student Activity Book
Pages 639–641
E2. 
Partition shapes and sets into equal shares.
MPE2. 
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
MPE5. 
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.
DPP Item A
Triangle Flash Cards: Group E Subtraction Facts
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).

Vocabulary in this Lesson