Lesson 6

At the Circus: Join and Take Away

Est. Class Sessions: 2
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Mathematical Standards

1.OA.A
Represent and solve problems involving addition and subtraction. (1.OA.A.1)
1.OA.B
Understand and apply properties of operations and the relationship between addition and subtraction. (1.OA.B.3)
1.OA.C
Add and subtract within 20. (1.OA.C.6)
1.OA.D
Work with addition and subtraction equations. (1.OA.D.8)

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.

A circus poster provides students with the opportunity to create, discuss, and solve addition and subtraction problems. This lesson introduces students to the take away or separate situation. Students are also guided to begin making connections between addition and subtraction as inverse operations.

Content in this Lesson

  • Representing addition and subtraction using stories, drawings, diagrams, counters, number sentences, number lines, or ten frames [E2].
  • Finding the related subtraction sentence for an addition sentence [E3].
  • Using strategies that apply the properties of addition (e.g., turn-around, zero) to solve addition and subtraction problems [E4].
  • Finding the unknown whole number in an addition or subtraction equation relating to three whole numbers [E5].
  • Adding and subtracting within 10 using invented, counting (e.g., counting on, counting up), and reasoning (e.g., making ten, using ten, using doubles) strategies [E7].
  • Solving word problems (e.g., join, separate/take away) involving two whole numbers whose answer is less than or equal to 10 [E6].
  • Knowing what is important to solve a problem [MPE1].
  • Finding addition and subtractions strategies to solve problems [MPE2].

Daily Practice and Problems S–V

S. Naming Even and Odd

T. Zero

U. Today's Date

V. Play Say 21

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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Student Pairs

connecting cubes
desk number lines (0–40)

Materials for the Teacher

Display of At the Circus (Student Activity Book) Page 129 or (Adventure Book)
Display of Taking Away at the Circus (Student Activity Book) Page 146
Display of Part-Whole Diagram and Number Sentences Master (Teacher Guide)
Display of Addition and Subtraction Stories (Student Activity Book) Pages 147–148
Display of the Ten Frames Master (Teacher Guide)
Unit 6 Assessment Record
Math Facts Class Record
chart paper
connecting cubes
other circus illustrations, optional. See Literature Connections section.

Materials Preparation

Prepare to Display an Addition Story. Write the following addition story on a chart: There are 2 clowns on the high wire and 3 clowns on the platform. How many clowns are there in all?

Under the problem, draw a part-whole diagram and a line for the number sentence or use the Part-Whole Diagram and Number Sentences Master.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices
Expectation Assessed
Circus Addition and Subtraction Stories
with the Feedback Box
Student Activity Book
Pages 149–150
E2.
Represent addition and subtraction using stories, drawings, diagrams, counters, number sentences, number lines, or ten frames.
E3.
Find the related subtraction sentence for an addition sentence.
E4.
Use strategies that apply the properties of addition (e.g., turn-around, zero) to solve addition and subtraction problems.
E5.
Find the unknown whole number in an addition or subtraction equation relating three whole numbers.
E6.
Solve word problems (e.g., join, separate/take away, part-whole, compare) involving two whole numbers whose answer is less than or equal to 10.
E7.
Add and subtract within 10 using invented, counting (e.g., counting on, counting up, counting back), and reasoning (e.g., making ten, using ten, using doubles) strategies.
MPE1.
Know the problem. I read the problem carefully. I know the questions to answer and what information is important.
MPE2.
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
DPP Item T
Zero
Teacher Guide - digital
E8.
Use mental math strategies to add (e.g., direct modeling, counting strategies, reasoning from known facts) for the facts in Groups A and B.