Upload
elaine-hart
View
31
Download
3
Tags:
Embed Size (px)
DESCRIPTION
Lesson 2-3 Pages 70-74. Subtracting Integers. What you will learn!. How to subtract integers. How to evaluate expressions containing variables. Vocabulary. What you really need to know!. Subtracting Integers: To subtract an integer, add its additive inverse. In plain English: - PowerPoint PPT Presentation
Citation preview
Lesson 2-3 Pages 70-74
Subtracting Integers
What you will learn!1. How to subtract integers.
2. How to evaluate expressions containing variables.
What you really need to know!
Subtracting Integers:To subtract an integer, add its additive inverse.
In plain English:Add the opposite of the number!
What you really need to know!
When you read the problem, say “and opposite of” for the minus sign!
Example 1:
Find 9 - 14-5
Think: 9 + (-14)
Example 2:
Find -10 - 8-18
Think: -10 + (-8)
Example 3:
Find 15 – (-4)19
Think: 15 + 4
Example 4:
Find -10 – (-7)-3
Think: -10 + 7
Example 5: What is the range for Wyoming?
StateState Lowest Temp Lowest Temp °F°F
Highest Temp Highest Temp °F°F
UtahUtah -69-69 117117
VermontVermont -50-50 105105
VirginiaVirginia -30-30 110110
WashingtonWashington -48-48 118118
West VirginiaWest Virginia -37-37 112112
WisconsinWisconsin -54-54 114114
WyomingWyoming -66-66 114114
114 + 66 = 180°F°F114 – (-66)
Example 6:
Evaluate:
m – (-2) if m = 4
6
Example 7:
Evaluate:
x - y if x = -14 and y = -2.
-12
Example 8:
Evaluate:
p + q – r
if p = -11, q = 6, and r = -12.
7
Page 72
Guided Practice
#’s 3-13
Pages 70-72 with someone at home
and study examples!
Read:
Homework: Pages 73-74
#’s 14-52 even
#’s 57-74
Lesson Check 2-3
Page
727
Lesson 2-3
Lesson Check 2-3
Prepare for Mid-Test!
Pages 90-91
#’s 8-29Odd Answers in Back of Book!