Lesson Plan: Part–Whole Bar Models: Numbers up to 20 Mathematics • 2nd Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use part–whole bar models to solve one-step addition and subtraction problems.


Students will be able to

  • write an equation to represent a part–whole bar model,
  • find a missing number in an equation represented by a part–whole bar model,
  • recognize whether addition or subtraction is needed to solve a problem represented by a part–whole bar model,
  • draw and complete a part–whole bar model for a given word problem,
  • use addition or subtraction and part–whole bar models to solve a word problem.


Students should already be familiar with

  • addition and subtraction within 20,
  • addition strategies, including making 10, using doubles, and using near doubles,
  • subtraction strategies, including counting on, counting back, and using a number line.


Students will not cover

  • numbers greater than 20,
  • comparative bar models.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.