[br]In this lesson, you'll learn how to add [color=#0000ff]INTEGERS[/color].[br][br]There are two cases:[br][br][color=#0000ff]Case 1[/color]—two [color=#0000ff]INTEGERS[/color] having the [color=#0000ff]SAME[/color] signs[br][br] Step 1. [color=#0000ff]ADD[/color] their [color=#0000ff]ABSOLUTE[/color] values.[br][br] Step 2. Apply the [color=#0000ff]COMMON[/color] sign of the [color=#0000ff]ADDENDS[/color] to the [color=#0000ff]SUM[/color].[br][br] Examples:    6 + 7 = 13[br][br]                           (-6) + (-7) = -13[br][br][color=#0000ff]Case 2[/color]—two [color=#0000ff]INTEGERS[/color] having [color=#0000ff]DIFFERENT[/color] signs[br][br] Step 1. [color=#0000ff]SUBTRACT[/color] their [color=#0000ff]ABSOLUTE[/color] values.[br][br] Step 2. Apply the sign of the [color=#0000ff]NUMBER[/color] having the [color=#0000ff]GREATER[/color] absolute value to the [color=#0000ff]SUM[/color].[br][br] Examples:     6 + (-7) = -1[br][br]                             (-6) + 7 = 1[br][br][color=#0000ff]NOTE:[/color] [br][br]1. If one of the integers is [color=#0000ff]ZERO[/color], the sum is the other integer since [color=#0000ff]ZERO[/color] is the [color=#0000ff]IDENTITY[/color] element for [color=#0000ff]ADDITION[/color].[br][br]2. The plus sign ( + ) is often omitted in the sum.

The [color=#0000ff]NUMBER LINE[/color] can be used to demonstrate how to add [color=#0000ff]INTEGERS[/color].[br][br]Use the applet below for practice[color=#0000ff].[/color] [br][br]Instructions:[br][br]1. Position the [color=#0000ff]WHITE DOT[/color] of the [color=#0000ff]BOTTOM[/color] arrow at the [color=#0000ff]ORIGIN ( 0 )[/color].[br][br]2. Drag the [color=#0000ff]WHITE DOT[/color] of the [color=#0000ff]TOP[/color] arrow to coincide with the arrowhead of the [color=#0000ff]BOTTOM[/color] arrow.[br][br]3. The [color=#0000ff]NUMBER[/color] (or [color=#0000ff]COORDINATE[/color]) under the arrowhead of the [color=#0000ff]TOP[/color] arrow is the [color=#0000ff]ANSWER[/color].[br][br]Repeat as many times as necessary to master the concept.

In future lessons, you'll learn how to perform other operations on integers. Did you have FUN today!