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157 lines
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HTML
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<h1 class="center">Absolute Value</h1>
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<h3>Absolute Value
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means ...</h3>
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<p class="center">... only <b>how far</b> a number is from zero:</p>
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<p class="center"><img src="images/absolute-value.svg" alt="absolute value 6 either way on number line" style="max-width:100%" height="98" width="590"></p>
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<p class="center">"6" is 6 away from zero,<br>
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and "−6" is <b>also</b> 6 away from zero.</p>
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<p class="center">So the absolute value of 6 is <b>6</b>,<br>
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and the absolute value of −6 is also <b>6</b></p>
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<p>More Examples:</p>
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<ul>
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<li>The absolute value of −9 is <b>9</b></li>
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<li>The absolute value of 3 is <b>3</b></li>
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<li>The absolute value of 0 is <b>0</b></li>
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<li>The absolute value of −156 is <b>156</b></li>
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</ul>
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<h3>No Negatives!</h3>
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<p>So in practice "absolute value" means to remove any negative sign in front of a number, and to think of all numbers as positive (or zero).</p>
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<h3>Absolute Value Symbol</h3>
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<p>To show that we want the absolute value of something, we put "|" marks either side (they are called "bars" and are found on the right side of a keyboard), like these examples:</p>
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<table style="border: 0; margin:auto;">
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<tbody>
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<tr style="text-align:center;">
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<td class="large" width="180">|−5| = 5</td>
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<td class="large" width="180">|7| = 7</td>
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</tr>
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</tbody></table>
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<p>Sometimes absolute value is also written as "abs()", so <b>abs(−1) = 1</b> is the same as <b>|−1| = 1</b></p>
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<h3>Try It Yourself</h3>
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<div class="script">
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images/absolute.js
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</div>
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<h3>Subtract Either Way Around</h3>
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<p>And it doesn't matter which way around we do a subtraction, the absolute value will always be the same:</p>
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<p class="so"><span class="large">|8−3| = 5</span> <i>(8−3 = 5)</i></p>
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<p class="so"><span class="large">|3−8| = 5</span> <i>(3−8 = −5, and |−5| = 5)</i></p>
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<p> </p>
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<h3>More Examples</h3>
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<p>Here are some more examples of how to handle absolute values:</p>
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<div class="example">
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<p class="center"><span class="large">|−3×6| = 18</span><br>
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Because −3<span class="large">×</span>6 = −18, and <b>|−18| = 18</b></p>
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</div>
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<div class="example">
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<p class="center"><span class="large">−|5−2| = −3</span><br>
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Because <b>5−2 = 3</b> and then the
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first minus gets us<b> −3</b></p>
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</div>
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<div class="example">
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<p class="center"><span class="large"></span><span class="large">−|2−5| = −3</span><br>
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Because <b>2−5 = −3</b> , <b>|−3| = 3</b>, and then the
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first minus gets us<b> −3</b></p>
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</div>
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<div class="example">
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<p class="center"><span class="large">−|−12| = −12</span><br>
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Because <b>|−12| = 12</b> and then the
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first minus gets us<b> −12</b></p>
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</div>
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<p> </p>
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<p class="center larger">Learn more at <a href="../algebra/absolute-value-solving.html">Absolute Value in Algebra</a></p>
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<p> </p>
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<div class="questions">1669, 5637, 5638, 5639, 5640, 5641, 5642, 1670, 1671, 1672, 2212, 2213, 2214</div>
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<div class="related">
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<a href="addition.html">Addition</a>
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<a href="../number-line.html">Number Line</a>
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<div id="copyrt">Copyright © 2022 Rod Pierce</div>
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