Lesson 6

Workshop: Multidigit Addition and Subtraction

Est. Class Sessions: 2–3
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Mathematical Standards

2.NBT.A
Understand place value. (2.NBT.A.1, 2.NBT.A.2)
2.NBT.B
Use place value understanding and properties of operations to add and subtract. (2.NBT.B.6, 2.NBT.B.7, 2.NBT.B.8, 2.NBT.B.9)
2.MD.B
Relate addition and subtraction to length. (2.MD.B.6)
2.OA.A
Represent and solve problems involving addition and subtraction. (2.OA.A.1)

Standards for Mathematical Practice

MP2.
Reason quantitatively.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.
MP7.
Look for and make use of structure.
MP8.
Look for and express regularity in repeated reasoning.

Students play new versions of games introduced earlier as they continue developing mental math and paper-and-pencil strategies for solving multidigit addition and subtraction problems.

Content in this Lesson

  • Using and applying place value concepts to make connections among representations of multidigit numbers using base-ten pieces, number lines, expanded form, and standard form [E1].
  • Representing addition and subtraction problems using base-ten pieces and number lines [E5].
  • Adding and subtracting multidigit numbers using mental math strategies (e.g., composing and decomposing numbers, counting) with base-ten pieces and number lines [E6].
  • Adding and subtracting multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, compact) [E7].
  • Choosing good tools and efficient strategies for different types of problems [MPE2].
  • Checking for reasonableness by estimating sums and differences and by solving a problem two ways [MPE3].
  • Using addition to check subtraction calculations [MPE4].
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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

set of base-ten pieces (2 packs, 11 flats, 20 skinnies, 21 bits)
envelope for storing digit cards
scissors

Materials for the Teacher

Display of Multidigit Addition Practice Menu (Student Activity Book) Page 759
Display of Take Your Places Please: 4 Digits (Student Activity Book) Pages 761–764
Display of Add to 1000 Game (Student Activity Book) Page 767
Display of Multidigit Subtraction Practice Menu (Student Activity Book) Page 769
Display of Path to Glory Game: Subtraction (Student Activity Book) Page 771
Display of Difference War (Student Activity Book) Pages 775–776
3 prepared display sets of the Digit Cards 0–9 Master (Teacher Guide). See Materials Preparation.
Unit 14 Assessment Record
Unit 14 Individual Assessment Record

Materials Preparation

Prepare Sets of Digit Cards. Each student will need a deck of 30 cards containing 3 sets of Digit Cards 0–9. If necessary, make 3 copies of the Digit Cards 0–9 Master per student and cut out the cards. Make 3 additional copies so that you can have a display deck of 30 cards as well. Provide students with envelopes. The deck of digit cards will be used in several games throughout the Workshop.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed
Multidigit Addition Practice Menu
Self-Check
Student Activity Book
Page 759
E6. 
Add and subtract multidigit numbers using mental math strategies (e.g., composing and decomposing numbers, counting) with base-ten pieces and number lines.
E7. 
Add and subtract multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, compact).
Multidigit Subtraction Practice Menu
Self-Check
Student Activity Book
Page 769
E6. 
Add and subtract multidigit numbers using mental math strategies (e.g., composing and decomposing numbers, counting) with base-ten pieces and number lines.
E7. 
Add and subtract multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, compact).
Multidigit Addition and Subtraction Quiz
with Feedback
Student Activity Book
Pages 777–779
E1. 
Use and apply place value concepts to make connections among representations of multidigit numbers using base-ten pieces, number lines, expanded form, and standard form.
E5. 
Represent addition and subtraction problems using base-ten pieces and number lines.
E6. 
Add and subtract multidigit numbers using mental math strategies (e.g., composing and decomposing numbers, counting) with base-ten pieces and number lines.
E7. 
Add and subtract multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, compact).
MPE2. 
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
MPE3. 
Check for reasonableness. I look back at my solution to see if my answer makes sense. If it does not, I try again.
MPE4. 
Check my calculations. If I make mistakes, I correct them.
MPE5. 
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.

Vocabulary in this Lesson