Lesson Plan: Checking Two-Digit Subtraction Problems by Adding Mathematics
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use addition to check the solutions to subtraction problems.
Objectives
Students will be able to
- use models to find the related addition for a subtraction problem,
- write an addition sentence to check the solution to a subtraction problem,
- check answers to subtraction word problems using addition.
Prerequisites
Students should already be familiar with
- subtracting two-digit numbers,
- adding up to two-digit numbers.
Exclusions
Students will not cover
- the column method of subtraction.
