Lesson 6

Solving Repeated Addition and Subtraction Problems

Est. Class Sessions: 2
X

Mathematical Standards

1.OA.A
Represent and solve problems involving addition and subtraction. (1.OA.A.1)
1.NBT.C
Use place value understanding and properties of operations to add and subtract. (1.NBT.C.4)

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.
MP7.
Look for and make use of structure.
MP8.
Look for and express regularity in repeated reasoning.

Students use drawings and invent strategies for solving word problems that involve repeated addition and repeated subtraction situations. They then write their own word problems.

Content in this Lesson

  • Representing addition and subtraction problems [E1].
  • Representing repeated addition and repeated subtraction using counters and drawings [E2].
  • Solving repeated addition and repeated subtraction problems using drawings, skip counting, and invented strategies [E3].
  • Knowing what is important to solve a problem [MPE1].
  • Finding strategies to solve problems [MPE2].
  • Showing or telling how to solve problems [MPE5].
  • Use labels to show what numbers mean [MPE6].
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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 Students

connecting cubes
desk number line (0–40)

Materials for the Teacher

Display of Check-In: Question 2 of Golden Eggs (Student Activity Book) Pages 485–486. See Materials Preparation.
Display of Math Practices page (Student Activity Book) Reference
Unit 14 Assessment Record
Unit 14 Individual Assessment Record
Math Facts Class Record
class number line (1–130)

Materials Preparation

Prepare Display of Sample Problem. To provide an example for the students, write the sample problem below on a display of Check-In: Question 2 of the Golden Eggs pages in the Student Activity Book.

One morning Tess and Jack found 9 golden eggs. They put them in boxes. If they put 3 eggs in each box, how many boxes would they need?

Assessment in this Lesson

Assessment Expectation Assessed Math Practices
Expectation Assessed
Golden Eggs
Check-In: Question 2
Student Activity Book
Pages 485–486
E1.
Represent addition and subtraction problems using counters, number lines, ten frames, drawings, or number sentences.
E2.
Represent repeated addition and repeated subtraction using counters drawings, and number sentences.
E3.
Solve repeated addition and repeated subtraction problems using drawings, skip counting, and invented strategies.
Pet Problems
with Feedback Box
Student Activity Book
Pages 489–490
E2.
Represent repeated addition and repeated subtraction using counters drawings, and number sentences.
E3.
Solve repeated addition and repeated subtraction problems using drawings, skip counting, and invented 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.
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.
DPP Item T
Strategies 3
Teacher Guide - digital
E4.
Use mental math strategies to solve addition and subtraction problems with larger numbers (e.g., 2 digit + 1 digit).
DPP Item U
Addition Facts 2
Teacher Guide - digital
E9.
Use math fact strategies to add (direct modeling, counting strategies, reasoning from known facts) for the facts in Group C (2 + 9, 3 + 8, 4 + 7,
5 + 6).

Vocabulary in this Lesson