Lesson 4

Addition Review

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.1, 3.NBT.A.2)

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.
MP6.
Attend to precision.

Students explore addition using their knowledge of place value. They add two-digit numbers using mental math strategies and paper-and-pencil methods (all-partials and compact). The lesson concentrates on understanding paper-and-pencil methods by making connections to base-ten pieces. This review prepares students for extending these concepts and skills to larger numbers in Lesson 5.

Content in this Lesson

  • Making connections between place-value concepts and representations of numbers (to the hundreds) with base-ten pieces and standard form [E1].
  • Solving two-digit addition problems using base-ten pieces [E2].
  • Adding two-digit numbers using mental math strategies [E3].
  • Adding two-digit numbers using all-partials and the compact method [E4].
  • Estimating sums using mental math strategies [E5].
  • Determining the reasonableness of a solution to an addition problem [MPE3].
  • Showing work to explain strategies [MPE5].
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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 Pairs

set of base-ten pieces: 2 packs, 14 flats, 30 skinnies, 50 bits

Materials for the Teacher

Display of Base-Ten Recording Sheets 2 Master (Teacher Guide)
Display of Addition Strategies Menu Master (Teacher Guide)
Display set of base-ten pieces
Unit 6 Assessment Record
chart paper

Assessment in this Lesson

Assessment Expectation Assessed Math Practice Assessed

Addition Review
Check-In: Questions 7–10
Student Guide
Page 139 with corresponding
Feedback Box
Teacher Guide - digital
E2.
Represent and solve addition problems using base-ten pieces and number lines.
E3.
Add multidigit numbers using mental math strategies (e.g., composing and decomposing numbers, counting on).
E4.
Add multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, and compact).
E5.
Estimate sums using mental math strategies (e.g., rounding using benchmarks, using convenient numbers, composing and decomposing numbers, counting on).
MPE3.
Check for reasonableness. I look back at my solution to see if my answer makes sense. If it does not, I try again.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.