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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html lang="en-us"><head><script async src="https://www.googletagmanager.com/gtag/js?id=G-3SJLGKR77H"></script><script>window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-3SJLGKR77H');</script><meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"><meta name="keywords" content="math games, logic games, numbers, games, eduactional games, games for kids, games for children, games for learning, place values"><meta name="description" content="Practice the basics of math with a game of speed and skill!"><meta http-equiv="pics-label" content='(PICS-1.1 "http://www.classify.org/safesurf/" l gen true for "http://education.jlab.org/" r (SS~~000 1))'><meta name="robots" content="index,all"><link rel="STYLESHEET" type="text/css" href="/css/main.css"><link rel="STYLESHEET" type="text/css" href="/css/speedmath.css"><link rel="STYLESHEET" type="text/css" href="/css/gameextra.css"><title>SpeedMath - Addition and Subtraction</title><script type="text/javascript">  </script></head><body> <div class="topnav" id="myTopnav"> <a href="/index.html" title="JLab Science Education Home"><img src="/g/scied_logo_sm.png" alt="Science Education Home"></a> <a href="/index.html" title="JLab Science Education Home">Home</a> <a href="/indexpages/teachers.html" title="Teacher Tools">Teachers</a> <a href="/indexpages/" title="Student Zone">Students</a> <a href="/indexpages/elementgames.html" title="Games and Puzzles">Games</a> <a href="/indexpages/science_videos.html" title="Science Videos">Videos</a> <a href="/solquiz/" title="Virginia Standards of Learning Practice Tests">VA SOL</a> <a href="/indexpages/program.html" title="Programs and Events">Programs</a> <div class="search-container"> <form action="/search/"> <input type="text" placeholder="Search..." name="q"> <button type="submit"><i class="fa fa-search"></i></button> </form> </div> <a href="javascript:void(0);" class="icon" title="Menu" onclick="navToggle();"> <i class="fa fa-bars"></i> </a> </div>   <div class="main"> <div class="content"><div id="titleimg"><img src="title.gif" width="494" height="30" alt="SpeedMath - Addition and Subtraction"></div><h1 id="subtitle">Welcome to SpeedMath - Addition and Subtraction!</h1><p class="txt">The goal of SpeedMath - Addition and Subtraction is to create an equation, as quickly as possible, from the four digits the computer gives you. You can use addition and subtraction to create your equation, but you are not allowed to rearrange the digits.</p><p class="txt">You are allowed to select the following:</p><p class="desc"><strong>Type of Game -</strong> Choose <strong>Single Player</strong> to practice SpeedMath. Choose <strong>Tournament Play</strong> if you want to challenge your classmates!</p><p class="desc"><strong>Length of Game -</strong> Single players can choose games consisting of 5, 10 or 15 questions. All tournaments are 10 questions long.</p><p class="txt"><a href="/smdeluxe/index.html">SpeedMath Deluxe</a>, <a href="/smmult/index.html">SpeedMath - Multiply and Divide</a> and <a href="/sminequality/index.html">SpeedMath - Inequalities</a> are also available.</p><noscript><p>If you are reading this, your browser is <strong>NOT</strong> running JavaScript.<br>JavaScript <strong>MUST</strong> be enabled for this section of our site to work.<br>Once you have turned JavaScript on, <a href="/solquiz/">reload this page</a><br>and this warning will go away.</p></noscript><div class="selectionboxcontainer"><div class="leftlist"><table class="selectiontable"><tr class="selectiontitle"><td>Type of Game</td></tr><tr class="selectionline"><td><p><a href="javascript:d_g(0,'s');"><img src="/g/checkbox-on.gif" width="20" height="14" alt="Single Player" id="game_type_0" onmouseover="javascript:toggle_checkbox('game_type_0','1');" onmouseout="javascript:toggle_checkbox('game_type_0','0');"></a><a href="javascript:d_g(0,'s');" onmouseover="javascript:toggle_checkbox('game_type_0','1');" onmouseout="javascript:toggle_checkbox('game_type_0','0');">Single Player</a></p><p><a href="javascript:d_g(1,'t');"><img src="/g/checkbox.gif" width="20" height="14" alt="Tournament Play" id="game_type_1" onmouseover="javascript:toggle_checkbox('game_type_1','1');" onmouseout="javascript:toggle_checkbox('game_type_1','0');"></a><a href="javascript:d_g(1,'t');" onmouseover="javascript:toggle_checkbox('game_type_1','1');" onmouseout="javascript:toggle_checkbox('game_type_1','0');">Tournament Play</a></p></td></tr></table></div><div class="rightlist"><table class="selectiontable"><tr class="selectiontitle"><td>Length of Game</td></tr><tr class="selectionline"><td><p><a href="javascript:d_h(0,5);"><img src="/g/checkbox.gif" width="20" height="14" alt="5" id="num_0" onmouseover="javascript:toggle_checkbox('num_0','1');" onmouseout="javascript:toggle_checkbox('num_0','0');"></a><a href="javascript:d_h(0,5);" onmouseover="javascript:toggle_checkbox('num_0','1');" onmouseout="javascript:toggle_checkbox('num_0','0');">5</a></p><p><a href="javascript:d_h(1,10);"><img src="/g/checkbox-on.gif" width="20" height="14" alt="10" id="num_1" onmouseover="javascript:toggle_checkbox('num_1','1');" onmouseout="javascript:toggle_checkbox('num_1','0');"></a><a href="javascript:d_h(1,10);" onmouseover="javascript:toggle_checkbox('num_1','1');" onmouseout="javascript:toggle_checkbox('num_1','0');">10</a></p><p><a href="javascript:d_h(2,15);"><img src="/g/checkbox.gif" width="20" height="14" alt="15" id="num_2" onmouseover="javascript:toggle_checkbox('num_2','1');" onmouseout="javascript:toggle_checkbox('num_2','0');"></a><a href="javascript:d_h(2,15);" onmouseover="javascript:toggle_checkbox('num_2','1');" onmouseout="javascript:toggle_checkbox('num_2','0');">15</a></p></td></tr></table></div></div><div id="startbutton"><a href="javascript:c_r();"><img src="/g/ready.gif" 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