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125 lines
5.5 KiB
HTML
125 lines
5.5 KiB
HTML
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<div class="video">jkWMJVBmYL0</div>
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<h1 id="title" align="center">Numbers, Numerals and Digits</h1>
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<p style="float:left; margin: 0 20px 5px 0;"><img src="images/arrow-thinks-4.jpg" alt="arrow the dog thinks 4" height="206" width="300"></p>
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<h2>Number</h2>
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<p>A <b>number</b> is a count or measurement that is really an <b>idea</b> in our minds.</p>
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<p>We write or talk about numbers using <b>numerals</b> such as "4" or "four".</p>
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<p>But we could also hold up 4 fingers, or tap the ground 4 times.</p>
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<p>These are all different ways of referring to the same number.</p>
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<p>There are also special numbers (like <a href="pi.html"><span class="times">π</span> (Pi)</a>) that can't be written exactly, but are still numbers because we know the <b>idea</b> behind them.</p>
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<h2>Numeral</h2>
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<p>A numeral is a <b>symbol or name</b> that stands for a number.</p>
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<div class="example">
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<p>Examples: <b>3</b>, <b>49</b> and <b>twelve</b> are all numerals.</p>
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</div>
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<p>So the number is an idea, the <b>numeral is how we write it.</b></p>
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<p style="float:right; margin: 0 0 5px 10px;"><img src="images/numeral-digit.svg" alt="numeral and digits" height="155" width="187"></p>
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<h2>Digit</h2>
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<p>A digit is a <b>single symbol</b> used to make numerals.</p>
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<p><b>0, 1, 2, 3, 4, 5, 6, 7, 8</b> and <b>9</b> are the ten digits we use in everyday numerals.</p>
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<p> </p>
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<div class="example">
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<p>Example: The numeral 153 is made up of 3 digits ("1", "5" and "3").</p>
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</div>
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<div class="example">
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<p>Example: The numeral 46 is made up of 2 digits ("4", and "6").</p>
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</div>
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<div class="example">
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<p>Example: The numeral 9 is made up of 1 digit ("9"). So a single digit can also be a numeral</p>
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</div>
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<p>We can use other symbols too, for example <a href="../hexadecimals.html">hexadecimal</a> also uses some letters!</p>
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<h2>Digits -> Numerals -> Numbers</h2>
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<p class="center">So digits make up numerals, and numerals stand for an <b>idea</b> of a number.<br>
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<img src="images/digit-numeral-number.svg" alt="digit, numeral and number vs letter, word and idea" height="191" width="415"><br>
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Just like letters make up words, and words stand for an idea of the thing.</p><h2>Number Instead of Numeral</h2>
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<p class="words">But often people (including myself) say "Number" when they really should say "Numeral" ... it doesn't really matter if you do that, because other people understand you.</p>
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<p>But try to use "digit" only when talking about the single symbols that make up numerals, OK?</p>
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<h2>Other Types of Digits and Numerals</h2>
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<p>We are all used to using numerals like "237" and "99", but the Romans used <a href="../roman-numerals.html">Roman Numerals</a>, and there have been many other digits and numerals used throughout history.</p>
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<p class="center"><img src="images/number-systems.svg" alt="number systems" height="102" width="388"></p>
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<p> </p>
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<a id="q"></a>
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<div class="questions">10181, 10182, 10183, 10184, 10185, 10186, 10187, 10188, 10189, 10190</div>
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<div class="related">
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<a href="index.html">Numbers Index</a>
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