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Lesson Plan: Part–Whole Bar Models: Numbers up to 20 Mathematics
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.
Objectives
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.
Prerequisites
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.
Exclusions
Students will not cover
- numbers greater than 20,
- comparative bar models.
