Lesson 3

Spinning Sums

Est. Class Sessions: 2–3
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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)
3.OA.D
Solve problems involving the four operations, and identify and explain patterns in arithmetic. (3.OA.D.9)

Standards for Mathematical Practice

MP2.
Reason quantitatively.
MP4.
Model with mathematics.
MP5.
Use appropriate tools strategically.
MP8.
Look for and express regularity in repeated reasoning.

Students spin two matching spinners to generate addition facts. They then look for patterns in sums and the addends to identify properties of addition.

Content in this Lesson

  • Using patterns in data to make predictions and solve problems [E1].
  • Identifying patterns in sums [E3].
  • Recognizing that the equal sign represents the relationship between two equal quantities [E4].
  • Using strategies that apply the properties of addition [E5].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

Student Guide
Student Activity Book

Teacher Resources

Teacher Guide - digital

Supplies for Student Groups

clear plastic spinners (or pencils with paper clips)

Materials for the Teacher

Display of the Spinning Sums Lab pages with the spinners, the data table, and the graph
   (Student Activity Book) Pages 37, 39, and 41
Unit 2 Assessment Record
chart paper
self-adhesive notes (optional)

Materials Preparation

Make a Chart for Outcomes. Prepare a large piece of chart paper to make a chart of all the outcomes. See Figure 3.

Prepare Spinners. Prepare spinners for each group of three students. To collect the data, each group can use two clear plastic spinners to cover the white and gray spinners on the Spinning Sums Lab page in the Student Activity Book. If you do not have clear spinners, you can use pencils and paper clips. Straighten out one end of the paper clip, and place a pencil through the curved end. Then put the point of the pencil on the center of the circle and spin the paper clip around the pencil, using the straightened end as a pointer. See Figure 1.

Figure 1: Using a pencil and paper clip as a spinner

Assessment in this Lesson

Assessment Expectation Assessed

Spinning Sums
Check-In: Questions 12–13
Student Guide
Page 23

E1.
Make predictions and generalizations using tables and graphs.
E3.
Identify patterns in sums and differences.

DPP Item L
Three Addends
Teacher Guide - digital

E5.
Use strategies that apply the properties of addition to solve addition and subtraction problems (e.g., making tens, using tens, thinking addition, using doubles).

Vocabulary in this Lesson