Adding Integers and Developing Rules - PowerPoint PPT Presentation

About This Presentation
Title:

Adding Integers and Developing Rules

Description:

Adding Integers and Developing Rules-9 + -6 Correct answer is -15 What are you doing with the numbers? If both signs are negative how does that affect your answer? – PowerPoint PPT presentation

Number of Views:224
Avg rating:3.0/5.0
Slides: 10
Provided by: Angeli232
Category:

less

Transcript and Presenter's Notes

Title: Adding Integers and Developing Rules


1
Adding Integers and Developing Rules
2
  • -9 -6
  • Correct answer is -15
  • What are you doing with the numbers?
  • If both signs are negative how does that affect
    your answer?

3
  • -12 7
  • Correct answer is -5
  • What are you doing with the numbers?
  • If the signs are different, how does that affect
    your answer?
  • 10 -6
  • Correct answer is 4
  • What are you doing with the numbers?
  • If the signs are different, how does that affect
    your answer?

4
Develop Rules
  • If you are adding integers with the same sign,
    what do you do? (Example 1)
  • Add the absolute value of the numbers keep the
    sign
  • If you are adding integers with different signs,
    what do you do? (Example 2 and 3)
  • Subtract the absolute value of the numbers, and
    keep the sign of the greater absolute value.
  • Absolute value how far the number is away from
    zero

5
Example 1
  • -9 -3
  • Adding integers with the same sign
  • Add the numbers
  • Keep the sign

9 3 12
-12
-9 -3 -12
6
Example 2
  • -15 7
  • Adding integers with different signs
  • Subtract the numbers
  • Take the sign of the greater absolute value.

15 7 8
-15 7 -8
-15 has the greater absolute value.
7
Example 2
  • 9 -4
  • Adding integers with different signs
  • Subtract the numbers
  • Take the sign of the greater absolute value.

9 4 5
9 -4 5
9 has the greater absolute value.
8
Practice Problems
  • -18 -4
  • 2. 25 -10
  • 3. -13 -5
  • 4. -19 6
  • -14 14
  • 6. -6 -3 7
  • 7. -5 8 -6

-22
15
-18
-13
0
-9 7
-2
3 -6
-3
9
Word Problems with Integers
  • At 8am the temperature was -6F. At noon, the
    temperature rose 9 degrees. What was the
    temperature at noon?
  • -6 9 3F
  • The temperature at noon was 3F.
  • A submarine is situated 400 feet below sea level.
    If it rises 125 feet, what is its new position?
  • -400 125 -275
  • The new position of the submarine is 275 feet
    below sea level.
Write a Comment
User Comments (0)
About PowerShow.com