Lesson 1

Addition Strategies

Est. Class Sessions: 2
X

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

MP2.
Reason quantitatively.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.

Students review mental math strategies for solving addition problems and extend their use to larger numbers. They review how to represent those strategies with manipulatives, number lines, and number sentences.

Content in this Lesson

  • Using making-tens and using-doubles strategies to solve addition problems [E5].
  • Using turn-around facts (commutativity) to add.
  • Representing strategies for solving addition problems with manipulatives, number lines, and number sentences [E2].
  • Developing mental math skills [E6].
  • Recognizing that the equal sign represents the relationship between two quantities [E4].
  • Extending addition strategies to problems with larger numbers (2-digit + 1-digit) [E5].
  • Communicating reasoning and strategies verbally and in writing [MPE2 and MPE5].
X

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

desk number line

Materials for Student Pairs

20 blue connecting cubes
20 red connecting cubes

Materials for the Teacher

Display of Math Practices page (Student Guide) Reference
Unit 2 Assessment Record
class number line 0–100

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed

Addition Strategies
Check-In:
Questions 13–14
Student Guide
Page 18
and the corresponding
Feedback Box
Teacher Guide
E4.
Recognize that the equal sign represents the relationship between two equal quantities.
E5.
Use strategies that apply the properties of addition to solve addition and subtraction problems (e.g., making tens, using tens, thinking addition, using doubles).
MPE2.
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.