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Adding Integers. Section 1.4. Objectives. Add positive and negative integers on a number line. (Gr. 6 NS 1.2) Add integers. (NS 1.2) Simplify expression by applying properties of rational numbers and justify the process used. (AF 1.3). Number Lines.

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Adding integers

Adding Integers

Section 1.4


Objectives
Objectives

  • Add positive and negative integers on a number line. (Gr. 6 NS 1.2)

  • Add integers. (NS 1.2)

  • Simplify expression by applying properties of rational numbers and justify the process used. (AF 1.3)


Number lines
Number Lines

  • You can use a number line to add integers.

  • There are two kinds – vertical numbers line and horizontal number lines.

  • Let’s take a closer look….


Horizontal number lines
Horizontal number lines

Negative = Left (red)

Positive = Right (blue)

  • -5 + 2 =

+2

-5

Origin (Start)


Adding integers1
Adding Integers

  • What happens when you add these integers?

  • 3 + 4 = 4. -5 + -2=

    2. -1 + -7= 5. 7 + 2=

    3. 6 + 8 = 6. -8 + -4=


Rule #1

Same sign Sum of numbers


Adding integers2

Adding Integers


Rule #2

differentsignsdifferenceof numbers(The larger number carries the sign.)


Adding integers3

Adding Integers


Rule #3

Zero added to any number equals the original number.


Adding integers4

Adding Integers


Adding opposites together will equal zero.

Rule #4


Meka opened a new bank account. Find her account balance after the first four transactions listed below.

Application

Deposits: $200, $20

Withdrawals: $166, $38

200 + 20 + (–166) + (–38)

Meka’s account balance after the first four transactions is ________.


Michael opened a new bank account. Find his account balance after the first four transactions listed below.

Application

Deposits: $175, $95

Withdrawals: $133, $65

175 + 95 + (–133) + (–65)

Michael’s account balance after the first four transactions is ____________.


Lesson quiz
Lesson Quiz after the first four transactions listed below.

Add.

1. –7 + (–7) 2. 15 + (–9) + (–2)

–14

4

Evaluate each expression for the given value of the variable.

3. 13 + r for r = –15 4. 2 + b + (–9) for b = –6

–2

–13

5. On Monday, a local dog shelter had six dogs. By Friday, they had found homes for three, but took in two more. Then how many dogs were in the shelter?

5 dogs


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