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Adding Integers Rules - PowerPoint PPT Presentation

Adding Integers Rules. Integer Addition Rules. Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers and then put the sign in front of your answer. 9 + 5 = 14. -9 + -5 = -14. Solve the Problems. -8. -3 + (-5) = 4 + 7 = 3 + 4 = -6 + (-7) =

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Presentation Transcript

• Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers and then put the sign in front of your answer.

9 + 5 = 14

-9 + -5 = -14

Solve the Problems

-8

• -3 + (-5) =
• 4 + 7 =
• 3 + 4 =
• -6 + (-7) =
• 5 + 9 =
• -9 + (-9) =

11

7

-13

14

-18

Solve These Problems

- += -

-1

• - +=
• + =
• - +=

+ =

1

- +=

-

-5

0

5

-10

10

Absolute Value

-7

+7

Absolute Value
• The distance a number is from zero on the number line.

Symbols: |2| = the absolute value of 2

Start at 0, count the jumps to 2.

-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7

It takes two jumps from 0 to 2.

|2| = 2

Absolute Value
• The distance a number is from zero on the number line.

Ex: |-4| =

Start at 0, count the jumps to -4.

-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7

It takes four jumps from 0 to -4.

|-4| = 4

You try:

Find the Absolute Value

of the Integer

1.

2.

3.

6

14

20

• Rule #2 – If the signs are different pretend the signs aren’t there. Subtract the smaller from the larger one and put the sign of the larger absolute value in front of your answer.

-9 + 5 =

9 - 5 =4

Larger absolute

Value

Solve These Problems

5 – 3 = 2

-2

• 3+ (-5) =
• -4 + 7 =
• 3+ (-4) =
• -6+ 7 =
• 5+ (-9) =
• -9+ 9 =

3

7 – 4 = 3

-1

4 – 3 =1

7 – 6 = 1

1

-4

9 – 5 = 4

0

9 – 9 = 0

Solve This Problem

– =

• - + =

-=

Solve This Problem

– =

• -2 + =

– =

-=

= -