© Boardworks 20121 of 8 Absolute Value. © Boardworks 20122 of 8 Information.
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Transcript of © Boardworks 20121 of 8 Absolute Value. © Boardworks 20122 of 8 Information.
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© Boardworks 20121 of 8
Absolute Value
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© Boardworks 20122 of 8
Information
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© Boardworks 20123 of 8
Absolute value
The absolute value of a number is its magnitude.
In other words, the absolute value of a number is the distance that the number is from the origin, zero, on the number line.
The symbol “| |” means “the absolute value of.”
The absolute value of a positive number is just the number itself. For example, |5.8| = 5.8.
0–4
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
4 unitsFor example, –4 is 4 units away from 0, so |–4| = 4.
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© Boardworks 20124 of 8
Absolute value
Figure out the absolute value of these numbers. Use the number line for reference.
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
|2| = 2 |–5| = 5 |–2| = 2 |0| = 0
Taylor checked her bank account balance and saw that it was –$10. What is the size of her debt?
|–10| = 10
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© Boardworks 20125 of 8
Diving
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© Boardworks 20126 of 8
Ordering absolute values and integers
How would you order the following absolute values from the least to the greatest?
|–4|, |54|, |0|, |–1|, |23|, |6|, |–12|
How would you order the following integers from the least to the greatest?
–4, 54, 0, –1, 23, 6, –12
|0| |–1| |–4| |6| |–12| |23| |54|
0–1–4 6–12 23 54
What do you notice about the difference in the order?
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© Boardworks 20127 of 8
Comparing absolute values
It is important to be able to compare two absolute values.
During a swimming race Anthony is 7 seconds behind the fastest swimmer. Grace is 5 seconds behind the fastest swimmer.
Who is the farthest behind? Show your answer in terms of absolute value.
|–7| is greater than |–5|, so Anthony is the farthest behind.
Anthony = |–7|Grace = |–5|
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© Boardworks 20128 of 8
Using absolute values