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Lesson Plan: Subtracting within 20 Using Counting Strategies

Lesson Plan
Grade 7
English

Lesson Plan: Subtracting within 20 Using Counting Strategies

At a Glance

  • Grade Level: Grade 7 (adapted for foundational numeracy skills review)
  • Subject: Mathematics
  • Lesson Title: Subtracting within 20 Using Counting On, Counting Back, and Decomposition
  • Class Duration: 50 minutes

Objectives & Learning Outcomes

By the end of this lesson, students will be able to:
  1. Subtract within 20 by using strategies such as counting on to 10, counting back to 10, and taking from 10.
  1. Decompose the subtrahend to count back efficiently and explain their reasoning using visual models.
  1. Connect subtraction strategies to addition, recognizing the part–part–total relationship.
  1. Represent and solve real-world subtraction word problems using number paths, number bonds, or manipulatives.
  1. Clearly communicate their problem-solving strategies through drawings, number sentences, and verbal explanations.

Standards Addressed

  • 1.OA.C.6: Add and subtract within 20, demonstrating fluency for addition and subtraction within 10; use strategies such as counting on, making ten, decomposing a number leading to a ten, using the relationship between addition and subtraction, and creating equivalent but easier or known sums.
  • 1.OA.A.1: Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.
Note: Standards are adapted from Grade 1 to support review or intervention in Grade 7, as referenced in the provided Eureka Math lessons.

Material & Resources Needed

For Teachers:
  • Floor Number Path (for class demonstration)
  • Digital Number Path removable (downloadable/printable)
  • Sample word problems for subtraction within 20
For Students:
  • Number Path removables (individual use)
  • Unifix® Cubes or similar manipulatives (20 per student)
  • Personal whiteboards and dry-erase markers
  • Handouts of number bonds and 5-group models (as shown in lesson visuals)
Lesson Preparation:
  • Photocopy or print Number Path removables and student pages with 5-groups and number paths for demonstration and practice.
  • Ensure manipulatives and whiteboards are distributed before class.
  • Prepare a visible class demonstration area for using the Floor Number Path.
Reference: Visuals and material recommendations are drawn from the lesson agendas and sample solutions on pages 1–2 and 11 of Reference 3 (Eureka Math2 Lesson 24) and similar content in Reference 2 (Lesson 23).