Lesson 4

Exploring with Base-Ten Pieces

Est. Class Sessions: 2
X

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.
MP3.
Construct viable arguments and critique the reasoning of others.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.

Students explore addition of two-digit and three-digit numbers using their knowledge of place value. The lesson focuses on estimating answers for addition problems, using base-ten pieces to model the problem, and making trades of base-ten pieces if necessary. Students record their work using base-ten shorthand and symbols.

Content in this Lesson

  • Using and applying place value concepts to make connections among representations of numbers using base-ten pieces, expanded form, and standard form [E1].
  • Representing addition problems using base-ten pieces and number sentences [E2].
  • Adding two-digit and three-digit numbers using base-ten pieces [E3].
  • Checking an answer for reasonableness [MPE3].
  • Showing or telling how to solve problems [MPE5].
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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

base-ten pieces (21 bits, 20 skinnies, 3–5 flats)
200 Chart optional
desk number line (0–100), optional

Materials for the Teacher

Display of Add with Base-Ten Pieces page (Student Activity Book) Page 335
Display of Trade for Fewest Pieces page (Student Activity Book) Page 337
Unit 7 Assessment Record
Display set of base-ten pieces (21 bits, 20 skinnies, 3–5 flats)

Materials Preparation

Prepare sets of Base-Ten Pieces. Place a set of base-ten pieces (21 bits, 20 skinnies, 3–5 flats) in a bag or box for each student pair.

Assessment in this Lesson

ASSESSMENT EXPECTATION ASSESSED MATH PRACTICES EXPECTATION ASSESSED
Collecting Pennies
with Feedback Box
Student Activity Book
Pages 339–340
E1.
Use and apply place value concepts to make connections among representations of numbers to the thousands using base-ten pieces, number lines, expanded form, and standard form.
E2.
Represent addition problems using base-ten pieces, number lines, and number sentences.
E3.
Add two-digit and three-digit numbers using mental math strategies (e.g., composing and decomposing numbers, counting on) using the 200 Chart, base-ten pieces, and number lines.
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.