Lesson 3

Number Sentences

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)

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 extend the ideas from Lesson 2, Big Base-Ten Hoppers. They write partitions of numbers in number sentences (equations). They identify true or false number sentences and find the value of unknowns to make number sentences true. The terms equation and unknown are introduced in this context.

Content in this Lesson

  • Composing and decomposing numbers using ones, tens, hundreds, and thousands [E4].
  • Showing partitions of large numbers using number lines and number sentences (e.g., 1705 = 1000 + 700 + 5) [E1].
  • Recognizing that different partitions of a number have the same total (e.g., 200 + 30 + 7 = 200 + 20 + 17) [E1].
  • Finding the value of unknowns to make number sentences true.
  • Representing and solving addition problems using number lines [E2].
  • Representing and solving subtraction problems using number lines [E3].
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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

Materials for Students

Feedback on Number Sentences Check-In: Questions 11–14 or other similar work

Materials for the Teacher

2 or 3 displays of What I Think Master (Teacher Guide) Page 119
Unit 4 Assessment Record

Materials Preparation

Provide Feedback. Prepare to provide students with timely feedback on Check-In: Questions 11–14 in the Student Guide or other similar work. Students will use this feedback to choose targeted practice during Summarizing the Lesson.

Assessment in this Lesson

Assessment Expectation Assessed
Number Sentences
Check-In: Questions 11–14
Student Guide
Page 126
and the corresponding 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.
E3.
Represent and solve subtraction problems using base-ten pieces and number lines.
Number Lines and Number Sentences
Self-Check with Practice Menu
Student Activity Book
Page 103
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.
E3.
Represent and solve subtraction problems using base-ten pieces and number lines.