Lesson 5

Subtraction Facts Strategies

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.2)
3.OA.D
Solve problems involving the four operations, and identify and explain patterns in arithmetic. (3.OA.D.9)

Standards for Mathematical Practice

MP2.
Reason quantitatively.
MP5.
Use appropriate tools strategically.
MP8.
Look for and express regularity in repeated reasoning.

This lesson begins a systematic review and practice of the subtraction facts, highlighting two subtraction strategies: using tens and thinking addition. Students practice checking subtraction problems by using addition.

Content in this Lesson

  • Using fact families to identify patterns in sums and differences [E3].
  • Using strategies that apply the properties of addition to solve subtraction problems [E5].
  • Determining the unknown in an addition or subtraction sentence relating three whole numbers [E7].
  • Using mental math skills to subtract [E6].
  • Communicating strategies verbally and in writing [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

two clear spinners or pencils and paper clips

Materials for the Teacher

Display of the Nine, Ten Game page (Student Activity Book) Page 47
Unit 2 Assessment Record
two clear spinners

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 Math Practice Assessed

Subtraction Facts Strategies
Check-In:
Questions 12–13
Student Guide
Page 45
and the corresponding
Feedback Box
Teacher Guide - digital
E3.
Identify patterns in sums and differences.
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).
E7.
Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Groups 1 and 2.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.