Lesson Plan: Subtracting Teen Numbers
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to subtract a teen number from a teen number by subtracting the tens and then the ones.
Objectives
Students will be able to
- use models to subtract a teen number by breaking it into tens and ones,
- complete subtraction equations showing the subtraction of tens and then ones,
- write subtraction equations showing the subtraction of tens and then ones.
Prerequisites
Students should already be familiar with
- decomposing teen numbers into a ten and some ones,
- subtracting ones from teen numbers.
Exclusions
Students will not cover
- subtracting 2-digit numbers other than teen numbers,
- number lines,
- minuends greater than 19.