Lesson 2

Hundreds, Tens, and Ones

Est. Class Sessions: 2
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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.2)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in solving them.
MP2.
Reason quantitatively.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.
MP7.
Look for and make sense of structure.

Students use base-ten pieces to represent three-digit numbers. They play a game to reinforce the concept that 10 base-ten pieces have the same value as the next larger piece. They explore different ways to partition numbers into ones, tens, and hundreds and look for the partition that uses the fewest pieces.

Content in this Lesson

  • Representing numbers (to the hundreds) using base-ten pieces, base-ten shorthand, and symbols [E1].
  • Partitioning (decomposing) numbers into ones, tens, and hundreds in more than one way [E2].
  • Showing different partitions of numbers using base-ten pieces and number sentences [E3].
  • Recognizing that different partitions of a number have the same total (e.g., 100 + 20 + 3 = 100 + 10 + 13) [E4].
  • Finding the partition that uses the fewest base-ten pieces.
  • Connecting base-ten partitions of a number to place value.
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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
  • DPP Item C
    Subtraction Flash Cards: Groups 5 and 6

Supplies for Student Pairs

set of base-ten pieces: 2 packs, 14 flats, 30 skinnies, and 50 bits
clear plastic spinner or pencil and paper clip

Materials for the Teacher

Display of Base-Ten Recording Sheets 1 Master (Teacher Guide) Page 63
Display of Make a Flat Game Board (Student Activity Book) Page 102
Unit 4 Assessment Record
Math Facts Class Record
Display set of base-ten pieces
Clear plastic spinners or pencil and paper clip

Materials Preparation

Gather Materials for Spinners. Students can either overlay clear spinners or use a pencil and a paper clip.

Assessment in this Lesson

Assessment Expectation Assessed

Hundreds, Tens, and Ones
Check-In: Questions 21–23
Student Guide
Page 75
E1.
Represent numbers (to the thousands) using base-ten pieces, words, and symbols.
E2.
Compose and decompose numbers using ones, tens, hundreds, and thousands.
E3.
Show different partitions of numbers using base-ten pieces, number lines, and number sentences.
E4.
Recognize that different partitions of a number have the same total (e.g., 100 + 20 + 3 = 100 + 10 + 13).

DPP Item C
Subtraction Flash Cards: Groups 5 and 6
Teacher Guide - digital
E7.
Use mental math strategies including counting strategies and thinking addition to solve subtraction facts in Groups 5 and 6.