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152 lines
5.6 KiB
HTML
152 lines
5.6 KiB
HTML
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<h1 align="center">Composing and Decomposing Numbers</h1>
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<p> </p>
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<table border="0" align="center">
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<tr>
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<td><p class="largest center">349</p></td>
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<td width="160" align="center">is made up of</td>
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<td><div class="simple">
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<table align="center">
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<tr align="center">
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<td width="100">hundreds</td>
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<td width="100">tens</td>
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<td width="100">ones</td>
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</tr>
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<tr>
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<td><p align="center" class="largest"> 3</p></td>
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<td><p align="center" class="largest"> 4</p></td>
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<td><p align="center" class="largest"> 9</p></td>
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</tr>
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</table>
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</div></td>
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</tr>
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</table>
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<h2>Composing </h2>
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<p>So 349 is <b>composed</b> of 3 hundreds, 4 tens and 9 ones, in other words:</p>
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<p class="center"><span class="largest">300 + 40 + 9 ⇒ 349</span><br>
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"Composing"
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</p>
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<div class="example">
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<h3> Example: Compose 2 hundreds, 7 tens and 9 ones.</h3>
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<p class="center"><b>200 + 70 + 9 = 279</b></p>
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</div>
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<h2>Decomposing</h2>
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<p>Decomposing is when we break the number apart:</p>
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<p class="center"><span class="largest">349 ⇒ 300 + 40 + 9</span><br>
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"Decomposing"</p>
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<div class="example">
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<h3> Example: Decompose 3,456</h3>
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<p class="center">3,456 = 3,000 + 400 + 50 + 6</p>
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</div>
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<h2>Standard and Expanded Form</h2>
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<p>Some people call the two different forms "Standard" and "Expanded":</p>
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<div class="simple">
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<table border="0" align="center">
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<tr align="center">
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<td width="180" class="large"><span class="largest"> 349 </span></td>
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<td width="180" class="large"><span class="largest"> 300 + 40 + 9</span></td>
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</tr>
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<tr align="center">
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<td>Standard Form</td>
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<td>Expanded Form</td>
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</tr>
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</table>
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</div>
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<p> </p>
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<div class="example">
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<h3> Example: Put 925 into Expanded Form</h3>
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<p class="center">925 = 900 + 20 + 5</p>
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</div>
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<h2>Decimal Numbers</h2>
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<p>We can also <span class="center">compose</span> and <span class="center">decompose</span> <a href="../decimals.html">decimal numbers</a>:</p>
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<p class="center"><span class="largest">37.2 ⇒ 30 + 7 + 0.2<br>
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</span>"Decomposing"</p>
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<p> </p>
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<p class="center"><span class="largest">4 + 0.7 + 0.08 ⇒ 4.78<br>
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</span>"Composing"</p>
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<p> </p>
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<div class="example">
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<h3> Example: Decompose 1.35</h3>
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<p class="center">1.35 = 1 + 0.3 + 0.05</p>
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</div>
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<p> </p>
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<div class="related">
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<a href="../place-value.html">Place Value</a><a href="index.html">Numbers Index</a> </div>
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