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120 lines
4.1 KiB
HTML
120 lines
4.1 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/abacus.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:45:34 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>Abacus</title>
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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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<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="preload" href="../images/style/font-champ-bold.ttf" as="font" type="font/ttf" crossorigin="">
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<link rel="preload" href="../style4.css" as="style">
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<link rel="preload" href="../main4.js" as="script">
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<link rel="stylesheet" href="../style4.css">
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<script src="../main4.js" defer="defer"></script>
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<script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-29771508-1"></script>
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<script>
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window.dataLayer = window.dataLayer || [];
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function gtag(){dataLayer.push(arguments);}
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gtag('js', new Date());
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gtag('config', 'UA-29771508-1');
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</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">Abacus</h1>
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<p style="float:right; margin: 0 0 5px 10px;"><img src="images/abacus.jpg" alt="abacus" height="101" width="180"></p>
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<p>An abacus has beads that slide on rods.</p>
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<p>It can be used to count, add, subtract, multiply and more.</p>
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<ul>
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<li>the column on the far right is for ones (1,2,3,...)</li>
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<li>the next column is for tens (10,20,30,...)</li>
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<li>the next column is for 100s (100,200,300,...)</li>
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<li>etc</li>
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</ul><br>
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Just like our decimal number system!
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<div class="example">
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<h3>Example: 413</h3>
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<p>Slide 3 beads UP on the right-most column<br>
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1 bead UP on the 2nd-from-right column<br>
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4 beads UP on the 3rd-from-right column</p>
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</div>
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<p> </p>
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<p>The most common abacus is split into two basic rows:</p>
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<p class="center larger">the top row is worth 5 of the bottom row</p>
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<p>There are two beads in the top row, and five beads in the bottom one.</p>
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<div class="example">
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<h3>Example:</h3>
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<p>7 can be made by using one bead on the top row, and 2 beads from the bottom row, because 5 + 2 = 7</p>
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</div>
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<p>Have a play with this one (click on the beads or enter a number):</p>
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<div class="script" style="height: 300px;">
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images/abacus.js
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</div>
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<p>The abacus has been around for thousands of years, and is still used in some parts of the world. Sometimes blind people will use an abacus, because they can feel the numbers easily.</p>
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<p>Expert abacus users can sometimes do calculations faster than on a calculator, and can even use them to find the square root of whole numbers.</p>
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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>
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<a href="index.html">Numbers Index</a>
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</div>
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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 Rod Pierce</div>
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</div>
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</body><!-- #EndTemplate -->
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