## Reflection: Flexibility Algorithms for Subtracting Integers - Section 1: Introduction

We made it through most of the introduction of the lesson when.... The fire alarm went off!  We had to evacuate the building for a drill.  I ended up losing about 10 minutes of class time.  I made the executive decision to skip the problem solving part of the lesson.  Students already saw that they could use addition to solve their subtraction problems.  I was a little bummed because I wanted them to explore other ways of thinking about it.  Maybe we'll find time some other day.

By the way, the fire drill went well!  We made it out of the building in the required time and all students were accounted for.

FIRE! (Drill)
Flexibility: FIRE! (Drill)

# Algorithms for Subtracting Integers

Unit 1: Rational Number Operations
Lesson 10 of 27

## Big Idea: Students use the additive inverse to subtract integers and then develop some of their own algorithms.

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Standards:
Subject(s):
Math, Number Sense and Operations, subtracting integers, rational numbers
50 minutes

### Grant Harris

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