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153 lines
5.6 KiB
HTML
153 lines
5.6 KiB
HTML
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<h1 align="center">Tens Complement</h1>
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<p align="center"><i><b>What Makes 10?</b></i></p>
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<p>The "Tens Complement" is the number we add to make 10:</p>
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<div class="example">
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<p>Example: The Tens Complement of <b>3</b> is <b>7</b>, because <b>3+7=10</b></p>
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</div>
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<div class="simple">
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<p>Here are all the
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Tens Complements: </p>
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<table border="0" align="center">
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<tr align="center">
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<th width="120">Number</th>
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<th width="120">Tens Complement</th>
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<th width="160">Why? Because:</th>
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</tr>
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<tr align="center">
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<td>0</td>
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<td>10</td>
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<td>0 + 10 = 10</td>
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</tr>
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<tr align="center">
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<td>1</td>
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<td>9</td>
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<td>1 + 9 = 10</td>
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</tr>
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<tr align="center">
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<td>2</td>
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<td>8</td>
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<td>2 + 8 = 10</td>
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</tr>
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<tr align="center">
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<td>3</td>
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<td>7</td>
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<td>3 + 7 = 10</td>
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</tr>
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<tr align="center">
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<td>4</td>
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<td>6</td>
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<td>4 + 6 = 10</td>
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</tr>
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<tr align="center">
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<td>5</td>
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<td>5</td>
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<td>5 + 5 = 10</td>
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</tr>
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<tr align="center">
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<td>6</td>
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<td>4</td>
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<td>6 + 4 = 10</td>
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</tr>
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<tr align="center">
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<td>7</td>
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<td>3</td>
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<td>7 + 3 = 10</td>
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</tr>
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<tr align="center">
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<td>8</td>
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<td>2</td>
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<td>8 + 2 = 10</td>
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</tr>
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<tr align="center">
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<td>9</td>
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<td>1</td>
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<td>9 + 1 = 10</td>
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</tr>
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<tr align="center">
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<td>10</td>
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<td>0</td>
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<td>10 + 0 = 10</td>
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</tr>
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</table>
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<p>But you only have to remember half the table!</p>
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<div class="def">
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<p align="center"><b>1</b> + <b>9 </b>= 10 and <b>9</b> + <b>1 </b>= 10</p>
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<p align="center"><b>1 and 9</b> are partners!</p>
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<p align="center">So are <b>2 and 8</b>, <b>3 and 7</b>, <b>4 and 6</b> and <b>5 and 5</b></p>
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</div>
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<h2>Why is this Important?</h2>
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<p>Knowing the Tens Complements makes some mental arithmetic a whole lot easier.</p>
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<p>For example it is used in <a href="subtraction-quick.html">Quick Subtraction</a>.</p>
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<h2 align="center">Practice!</h2>
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<p align="center">You can practice by using <a href="fix-equation-10.html">What Makes 10?</a></p>
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<div class="related"> <a href="fix-equation-10.html">What Makes 10?</a><a href="index.html">Numbers Index</a></div>
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