Adding Integers

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Adding Integers

• 2-1

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Vocabulary

• Integer The set of whole numbers, zero, and
  their opposites.
• Opposite Two numbers with the same absolute
  values but different signs
• Absolute Value the distance of a number on a
  number line from zero.

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Adding Integers Two Methods
The Number Line Method
The Absolute Value Method
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Your Turn
Find -3(-6)
Answer 9
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Example 1
Find 4 (-6)
Method 1 Use a number line.
Move 4 units right.
From there, move 6 units left.
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Example 2
Find -21 (-5)
Method 2 Use the absolute value method
-21 (-5) -26
Both numbers are negative, so the sum in negative.
Answer 26
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Example 3
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Example 4 Evaluating Expressions with Integers
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Review