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Lesson: Comparative Bar Models: Numbers up to 20 Mathematics • 1st Grade

In this lesson, we will learn how to solve one-step additive comparison problems with numbers up to 20 by drawing a comparative bar model.

Lesson Plan

Students will be able to

  • explain that comparative bar models are used when comparing two numbers,
  • draw and complete a comparative bar model for a given word problem,
  • recognize whether addition or subtraction is needed to solve a problem,
  • write an equation to represent a bar model,
  • use addition or subtraction to solve a word problem.

Lesson Playlist

  • Subtraction of Numbers up to 9
    00:56

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