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149 lines
5.4 KiB
HTML
149 lines
5.4 KiB
HTML
<!DOCTYPE html>
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<html lang="en"><!-- #BeginTemplate "/Templates/Main.dwt" --><!-- DW6 -->
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<!-- Mirrored from www.mathsisfun.com/numbers/number-line-zoom.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:58:36 GMT -->
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<!-- #BeginEditable "doctitle" -->
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<title>Zoomable Number Line</title>
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<script src="images/number-zoom.js" type="text/javascript"></script>
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<link rel="stylesheet" type="text/css" href="../stylejs.css">
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<meta name="Description" content="Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.">
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<!-- #EndEditable -->
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<meta name="keywords" content="math, maths, mathematics, school, homework, education">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<meta name="HandheldFriendly" content="true">
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<meta name="referrer" content="always">
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<link rel="stylesheet" href="../style4.css">
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<script src="../main4.js"></script>
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<script>document.write(gTagHTML())</script>
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</head>
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<body id="bodybg">
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<div id="stt"></div>
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<div id="adTop"></div>
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<header>
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<div id="hdr"></div>
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<div id="tran"></div>
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<div id="adHide"></div>
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<div id="cookOK"></div>
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</header>
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<div class="mid">
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<nav>
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<div id="menuWide" class="menu"></div>
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<div id="logo"><a href="../index.html"><img src="../images/style/logo.svg" alt="Math is Fun"></a></div>
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<div id="search" role="search"></div>
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<div id="linkto"></div>
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<div id="menuSlim" class="menu"></div>
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<div id="menuTiny" class="menu"></div>
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</nav>
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<div id="extra"></div>
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<article id="content" role="main">
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<!-- #BeginEditable "Body" -->
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<h1 class="center">Zoomable Number Line</h1>
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<p class="center"><b>Click</b> on number line to zoom in, <b>shift-click</b> to zoom out.<br>
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Click at left or right to scroll.</p>
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<script>numberzoomMain();</script>
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<h2>Learn About Numbers</h2>
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<p>See that numbers behave the same, whether they are 1, 2, 3, or 10, 20, 30, or 0.01, 0.02, 0.03.</p>
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<p>Learn about decimals:</p>
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<ul>
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<li>Zoom in and look at: 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, ...</li>
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<li>Then ask: what is 0.9 + 0.1 ?</li>
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</ul>
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<p>Do the same after zooming in further:</p>
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<ul>
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<li>What is 0.09 + 0.01?</li>
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<li>What is 0.19 + 0.01?</li>
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<li>What is 0.99 + 0.01?</li>
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</ul>
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<p>You can see how decimal place values work and get a feel for "infinite" sub-divisibility (but this tool gets into trouble around 30 decimal places).</p>
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<h2>Using</h2>
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<p><span class="center"><b>Click</b> on number line to zoom in, <b>shift-click</b> to zoom out.</span> It will zoom from where you click.</p>
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<p><span class="center">Click at left or right to scroll. </span></p>
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<table style="border: 0; margin:auto;">
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<tbody>
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<tr>
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<td><img src="../images/style/udlr-keyboard.png" alt="left-up-right-down keyboard" height="68" width="85"></td>
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<td> </td>
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<td>
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<p>Or you can use your keyboard's arrow keys.<br>
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Up/down to zoom, left/right to move.</p></td>
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</tr>
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</tbody></table>
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<p>Try this:</p>
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<ul>
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<li>Use the "right" key, you will see the counting numbers whizz past.</li>
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<li>Stop when you reach 100.</li>
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<li>Go back to zero (press the reset button).</li>
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<li>Zoom in to show 0.1, 0.2, 0.3, ...</li>
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<li>Now try tracking right. The tenths whizz by.</li>
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<li>How long does it take to reach 100 now?</li>
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<li>Try zooming in to 0.01, 0.02, 0.03, ...</li>
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<li>How long does it take to track across to 100 now (if you have the patience!) ?</li>
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</ul>
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<p>How much better to realise that you can zoom out a level and go up in tens. Then you can zoom in so that you are at 100.00 </p>
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<p>Test yourself. Start at 0. Use the zoom and left/right to find these numbers:</p>
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<ul>
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<li>3.4</li>
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<li>17.85</li>
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<li>−17.85</li>
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<li>100.00357</li>
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</ul>
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<h2>Race To 100.00357</h2>
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<p>Challenge your friends! Start at 0 (press the '0' button), then see how fast you can get to 100.00357 (you must see that number on the screen).</p>
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<h2>Least Moves</h2>
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<p>How many moves does it take to find a number?</p>
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<p>Not against the clock but by counting the number of moves you make.</p>
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<table style="border: 0;">
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<tbody>
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<tr>
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<td><img src="../images/style/udlr-keyboard.png" alt="left-up-right-down keyboard" height="68" width="85"></td>
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<td> </td>
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<td>
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<p>Use just the arrow keys and try to find the <b>least number of key-presses</b> to reach a number</p>
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<p>(Note: A count of your keystrokes is in the bottom corner.)</p></td>
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</tr>
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</tbody></table>
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<p>How many moves does it take you to reach:</p>
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<ul>
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<li><b> 3.4</b> (it took me 7 moves)</li>
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<li><b>22.45</b> (it took me 18 moves)</li>
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<li><b>100.00357</b> (it took me 51 moves)</li>
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</ul>
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<p> </p>
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<div class="related">
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<a href="../number-line.html">Number Line</a>
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<a href="number-line-using.html">Using The Number Line</a>
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<a href="number-line-scroll.html">Scrolling Number Line</a>
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<a href="skip-counting.html">Skip Counting</a>
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<a href="skip-counting-game.html">Skip Counting Game</a>
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</div>
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<!-- #EndEditable -->
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</article>
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<div id="adend" class="centerfull noprint"></div>
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<footer id="footer" class="centerfull noprint"></footer>
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<div id="copyrt">Copyright © 2021 MathsIsFun.com</div>
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</div>
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</body><!-- #EndTemplate -->
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<!-- Mirrored from www.mathsisfun.com/numbers/number-line-zoom.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:58:36 GMT -->
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