TEKS 6.1CLesson 2 (2nd 6 Weeks)

Integers

include whole numbers, zero, and negative whole numbers. can be represented on a number line that extends in both directions from zero.

Integers to the right of 0 are read using the word positive.

Ex: +6 is read as “positive 6” Integers to the left of 0 are read using the word negative.

Ex: -6 is read as “negative 6”. The number 0 is neither negative nor positive.

The integers decrease from right to left on the number line.

Ex: -6 < -5 and -7 < -6 The integers increase from left to right on the number line.

Ex: -5 > -6 and -6 > -7use a negative sign to represent a negative number

Positive integers can be written with or without a positive sign, such as 2 or +2If a number does not have a sign in front of it, it can be assumed the number is positive.

Examples

An object fell 300 feet.The integer -300 represent the change in height.

A football team gained 3 yards on the first down.

The integer 3 represent the gain in yardage.A price on a television is advertised as “Save $250 off the regular price.”

The integer -250 represent the reduction in price.

The high temperature in Alaska was 17 degrees below zero today.

The integer -17 represent the temperature.The temperature was 45°F at 2:00 P.M. At 5:30 P.M. the temperature was 51°F.

The integer 6 represent the temperature increase.The submarine was 50 feet below sea level.

The integer -50 represent the depth.

Example using a Number Line

Lindel mows lawns during the summer. He begins at his house on Thursday. The first lawn he mows is 7 blocks directly west of his house. The second lawn he mows is 3 blocks directly east of the first lawn. The last lawn he mows is 4 block directly west of the second lawn. Where is Lindel from his house when he finishes mowing the last lawn?

Lindel mows lawns during the summer. He begins at his house on Thursday. The first lawn he mows is 7 blocks directly west of his house. The second lawn he mows is 3 blocks directly east of the first lawn. The last lawn he mows is 4 block directly west of the second lawn. Where is Lindel from his house when he finishes mowing the last lawn?

Lindel’s House

Lindel’s 1st Lawn

Lindel’s 2nd Lawn

Lindel’s 3rd Lawn

The model shows that Lindel is 8 blocks west of his house.

-7

+3

-4