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Fill in < , > , or = for each of the following:

  1. | −9 | ___ | −9 |
  2. 2 ___ | −2 |
  3. −8 ___ | −8 |
  4. | −5 | ___ −5

  1. >
  2. >
  3. <
  4. =
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Fill in < , > , or = for each of the following:

  1. 7 ___ | −7 |
  2. | −11 | ___ −11
  3. | −4 | ___ | −4 |
  4. −1 ___ | −1 |

  1. >
  2. =
  3. >
  4. <
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Absolute value bars act like grouping symbols. First simplify inside the absolute value bars as much as possible. Then take the absolute value of the resulting number, and continue with any operations outside the absolute value symbols.

Simplify:

  1. | 9 −3 |
  2. 4 | −2 |

Solution

For each expression, follow the order of operations. Begin inside the absolute value symbols just as with parentheses.

|9−3|
Simplify inside the absolute value sign. |6|
Take the absolute value. 6
4|−2|
Take the absolute value. 4⋅2
Multiply. 8

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Simplify:

  1. | 12 9 |
  2. 3 | −6 |

  1. 3
  2. 18
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Simplify:

  1. | 27 16 |
  2. 9 | −7 |

  1. 11
  2. 63
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Simplify: | 8 + 7 | | 5 + 6 | .

Solution

For each expression, follow the order of operations. Begin inside the absolute value symbols just as with parentheses.

|8+7|−|5+6|
Simplify inside each absolute value sign. |15|−|11|
Subtract. 4

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Simplify: | 1 + 8 | | 2 + 5 |

2

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Simplify: | 9 −5 | | 7 6 |

3

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Simplify: 24 | 19 3 ( 6 2 ) | .

Solution

We use the order of operations . Remember to simplify grouping symbols first, so parentheses inside absolute value symbols would be first.

24 | 19 3 ( 6 2 ) |
Simplify in the parentheses first. 24 | 19 3 ( 4 ) |
Multiply 3 ( 4 ) . 24 | 19 12 |
Subtract inside the absolute value sign. 24 | 7 |
Take the absolute value. 24 7
Subtract. 17
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Simplify: 19 | 11 4 ( 3 1 ) |

16

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Simplify: 9 | 8 4 ( 7 5 ) |

9

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Translate word phrases into expressions with integers

Now we can translate word phrases into expressions with integers    . Look for words that indicate a negative sign. For example, the word negative in “negative twenty” indicates −20 . So does the word opposite in “the opposite of 20 .”

Translate each phrase into an expression with integers:

  1. the opposite of positive fourteen
  2. the opposite of −11
  3. negative sixteen
  4. two minus negative seven

Solution

  1. the opposite of fourteen
    −14
  2. the opposite of −11
    ( −11 )
  3. negative sixteen
    −16
  4. two minus negative seven
    2 ( −7 )
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Translate each phrase into an expression with integers:

  1. ⓐ the opposite of positive nine
  2. ⓑ the opposite of −15
  3. ⓒ negative twenty
  4. ⓓ eleven minus negative four

  1. ⓐ −9
  2. ⓑ 15
  3. ⓒ −20
  4. ⓓ 11−(−4)
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Translate each phrase into an expression with integers:

  1. the opposite of
  2. the opposite of twenty-two
  3. negative nine
  4. negative eight minus negative five

  1. 19
  2. −22
  3. −9
  4. −8−(−5)
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As we saw at the start of this section, negative numbers are needed to describe many real-world situations. We’ll look at some more applications of negative numbers in the next example.

Translate into an expression with integers:

  1. The temperature is 12 degrees Fahrenheit below zero.
  2. The football team had a gain of 3 yards.
  3. The elevation of the Dead Sea is 1,302 feet below sea level.
  4. A checking account is overdrawn by $40.

Solution

Look for key phrases in each sentence. Then look for words that indicate negative signs. Don’t forget to include units of measurement described in the sentence.

The temperature is 12 degrees Fahrenheit below zero.
Below zero tells us that 12 is a negative number. 12ºF

The football team had a gain of 3 yards.
A gain tells us that 3 is a positive number. 3 yards

The elevation of the Dead Sea is 1,302 feet below sea level.
Below sea level tells us that 1,302 is a negative number. 1,302 feet

A checking account is overdrawn by $40.
Overdrawn tells us that 40 is a negative number. $40

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Practice Key Terms 4

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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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