## Positive and Negative Integers

### Subject: Mathematics

Standard: Real and Complex Number Systems
Objective:
-Students will learn how to add and subtract positive and negative integers.
Background:
-This lesson takes place towards the beginning of the first semester. The students are being introduced to algebra tiles and will be shown various methods to adding and subtracting positive and negative integers.
Materials:
-Projector
-SmartBoard
-Behavior Cards
-Pencils
-Paper
-Calculator
-Algebra Tiles
-Number Line
-Worksheet
Introduction:
1.The teacher will display on the SmartBoard an orange background used to review adding and subtracting of positive integers. The students will do
several problems to remind themselves of past material.
2.The teacher will pass out algebra tiles to the students and explain that a small square represents + 1 when it is yellow and-1 when it is red. The
teacher will then display several examples and have the students practice setting them up.
3.The teacher will display the equation-2 + 3 on a green background. The teacher will watch as the students set up the equation using their algebra
tiles. The teacher will then explain that a “red” negative tile and a “yellow” positive tile cancel each other out be cause they equal zero. The
students will make pairs of red and yellow and the remaining tiles are the answer. The teacher and students will work through several examples together.