Lesson 4

Addition

Est. Class Sessions: 2–3
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Mathematical Standards

4.NBT.A
Generalize place value understanding for multi-digit whole numbers. (4.NBT.A.1, 4.NBT.A.2, 4.NBT.A.3)
4.NBT.B
Use place value understanding and properties of operations to perform multi-digit arithmetic.(4.NBT.B.4)
4.OA.A
Use the four operations with whole numbers to solve problems. (4.OA.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.
MP6.
Attend to precision.
MP7.
Look for and make use of structure.

Students review place-value concepts and strategies for adding larger numbers. They make connections between the base-ten representations and paper-and-pencil methods for addition and they develop mental math strategies. The goal of the lesson is to improve students' skills and understanding of concepts so they can choose appropriate methods to solve addition problems efficiently and accurately.

Content in this Lesson

  • Showing partitions of numbers using base-ten pieces and number sentences [E1].
  • Representing addition problems using base-ten pieces [E2].
  • Estimating sums [E11].
  • Adding multidigit numbers using paper-and-pencil methods (expanded form, all-partials, and compact) [E6].
  • Choosing from among mental math, estimation, and paper-and-pencil methods to add [E9].
  • Using mental math strategies to add [E4].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide
  • Addition
    Homework section
    Pages 135–136
  • Addition
    Check-In:
    Questions
    17–20
    Page 134
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Student Pairs

set of base-ten pieces: 2 packs, 14 flats, 30 skinnies, 50 bits
storage container (shoe box, large bag)

Materials for the Teacher

Display of Base-Ten Recording Sheet Master (Teacher Guide)
Display of Addition Strategies Menu (Student Activity Book) Page 113 or (Student Guide) Reference
Unit 4 Assessment Record
chart paper
set of base-ten pieces: 2 packs, 14 flats, 30 skinnies, 50 bits
Display set of base-ten pieces, optional

Materials Preparation

Digit Cards. Make a set of Digit Cards 0–9 using index cards, a deck of playing cards, or the Digit Cards 0–9 Masters. If using playing cards, the ace can stand for 1 and a face or joker card can stand for zero. These cards will be used to play a game in DPP item M.

Assessment in this Lesson

Assessment Expectation Assessed
Addition
Check-In: Q# 17–20
Student Guide
Page 134 and corresponding
Feedback Box
Teacher Guide - digital
E2.
Represent and solve addition problems using base-ten pieces and number lines.
E4.
Solve addition and subtraction problems using mental math strategies (e.g., composing and decomposing numbers, counting up, and counting back).
E6.
Add multidigit numbers using paper-and-pencil methods (expanded form, all-partials, and compact).
E9.
Choose appropriately from among mental math, estimation, and paper-and-pencil methods to add and subtract whole numbers.
E11.
Estimate sums and differences.
Place Value and Addition Quiz with Feedback Box
Teacher Guide - digital
E1.
Show that different partitions of the same number are equal using base-ten pieces, number lines, and number sentences (e.g., 200 + 30 + 7 = 200 + 20 + 17).
E2.
Represent and solve addition problems using base-ten pieces and number lines.
E4.
Solve addition and subtraction problems using mental math strategies (e.g., composing and decomposing numbers, counting up, and counting back).
E6.
Add multidigit numbers using paper-and-pencil methods (expanded form, all-partials, and compact).
E9.
Choose appropriately from among mental math, estimation, and paper-and-pencil methods to add and subtract whole numbers.
E11.
Estimate sums and differences.