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9-1 Integers and Absolute Value Learn to identify and graph integers and find opposites.

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9-1 Integers and Absolute Value Vocabulary positive number negative number opposites integer absolute value

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9-1 Integers and Absolute Value Positive numbers are greater than 0. They may be written with a positive sign (+), but they are usually written without it. Negative numbers are less than 0. They are always written with a negative sign (–).

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9-1 Integers and Absolute Value Additional Example 1: Identifying Positive and Negative Numbers in the Real World Name a positive or negative number to represent each situation. A. a jet climbing to an altitude of 20,000 feet B. taking $15 out of the bank Positive numbers can represent climbing or rising. +20,000 Negative numbers can represent taking out or withdrawing. –15

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9-1 Integers and Absolute Value Additional Example 1: Identifying Positive and Negative Numbers in the Real World Name a positive or negative number to represent each situation. C. 7 degrees below zero Negative numbers can represent values below or less than a certain value. –7

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9-1 Integers and Absolute Value Check It Out: Example 1 Name a positive or negative number to represent each situation. A. 300 feet below sea level B. a hiker hiking to an altitude of 4,000 feet Negative numbers can represent values below or less than a certain value. –300 Positive numbers can represent climbing or rising. +4,000

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9-1 Integers and Absolute Value Check It Out: Example 1 Name a positive or negative number to represent each situation. C. spending $34 Negative numbers can represent losses or decreases. –34

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9-1 Integers and Absolute Value You can graph positive and negative numbers on a number line. On a number line, opposites are the same distance from 0 but on different sides of 0. Integers are the set of all whole numbers and their opposites. –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 Opposites Positive IntegersNegative Integers 0 is neither negative nor positive.

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9-1 Integers and Absolute Value The set of whole numbers includes zero and the counting numbers. {0, 1, 2, 3, 4, …} Remember!

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9-1 Integers and Absolute Value Additional Example 2: Graphing Integers Graph each integer and its opposite on a number line. A. +2 –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 B. –5 –2 is the same distance from 0 as +2. –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 +5 is the same distance from 0 as –5.

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9-1 Integers and Absolute Value Additional Example 2: Graphing Integers Graph each integer and its opposite on a number line. C. +1 –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 –1 is the same distance from 0 as +1.

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9-1 Integers and Absolute Value Check It Out: Example 2 Graph each integer and its opposite on a number line. A. +3 –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 B. –4 –3 is the same distance from 0 as +3. –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 +4 is the same distance from 0 as –4.

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9-1 Integers and Absolute Value Check It Out: Example 2 Graph each integer and its opposite on a number line. C. 0 –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 Zero is its own opposite.

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9-1 Integers and Absolute Value The absolute value of an integer is its distance from 0 on a number line. The symbol for absolute value is ||. –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 |–3| = 3 |3| = 3 | | | Absolute values are never negative. Opposite integers have the same absolute value. |0| = 0

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9-1 Integers and Absolute Value Additional Example 3A: Finding Absolute Value Use a number line to find the absolute value of each integer. A. |–2| –2 is 2 units from 0, so |–2| = 2 2 –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5

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9-1 Integers and Absolute Value Additional Example 3B: Finding Absolute Value Use a number line to find the absolute value of each integer. B. |8| 8 is 8 units from 0, so |8| = 8 8 –1 0 1 2 3 4 5 6 7 8 9

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9-1 Integers and Absolute Value Check It Out: Example 3A Use a number line to find the absolute value of each integer. A. |6| 6 is 6 units from 0, so |6| = 6 6 –1 0 1 2 3 4 5 6 7 8 9

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9-1 Integers and Absolute Value Check It Out: Example 3B Use a number line to find the absolute value of each integer. B. |–4| –4 is 4 units from 0, so |–4| = 4 4 –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5

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