TEKS 6.1C Lesson 2 (2 nd 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 > -7 use a negative sign to represent a negative number

Positive integers can be written with or without a positive sign, such as 2 or +2 If 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’s House Lindel’s 1 st Lawn Lindel’s 2 nd Lawn Lindel’s 3 rd Lawn The model shows that Lindel is 8 blocks west of his house