1235 /www/nrich/html/content/00/06/game1/ 2 2011-02-01T00:00:01 <?xml version="1.0" encoding="UTF-8"?> <mdoxml version="1.0"><br></br> <p>This game offers you an opportunity to improve your ability to estimate angles.<br></br> <br></br> You can either play on your own or challenge a friend.<br></br> In both cases you will have 10 goes.<br></br> The closer you get to the target angle the more points you will score.<br></br> <br></br> There are three levels:<br></br> <br></br> Level $1: 0-90^\circ$<br></br> Level $2: 0-180^\circ$<br></br> Level $3: 0-360^\circ$</p> <p><a href="/content/00/06/game1/StopClock.swf">Full Screen Version</a></p> <p><mdo:flash classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0" data="/content/00/06/game1/StopClock.swf" height="500" width="550"><param name="allowfullscreen" value="true"></param><param name="quality" value="high"></param> <param name="movie" value="/content/00/06/game1/StopClock.swf"></param> </mdo:flash></p> <p> </p></mdoxml> <?xml version="1.0" encoding="UTF-8"?> <mdoxml version="1.0"><div class="embed"> <h2>Estimating Angles</h2> <br></br> <p>This game offers you an opportunity to improve your ability to estimate angles.<br></br> <br></br> You can either play on your own or challenge a friend.<br></br> In both cases you will have 10 goes.<br></br> The closer you get to the target angle the more points you will score.<br></br> <br></br> There are three levels:<br></br> <br></br> Level $1: 0-90^\circ$<br></br> Level $2: 0-180^\circ$<br></br> Level $3: 0-360^\circ$</p> <p><a href="/content/00/06/game1/StopClock.swf">Full Screen Version</a></p> <p><mdo:flash height="500" id="/content/00/06/game1/StopClock.swf" width="550"><param name="allowfullscreen" value="true"></param><param name="allowfullscreen" value="true"></param> <param name="quality" value="high"></param> <param name="movie" value="/content/00/06/game1/StopClock.swf"></param> </mdo:flash></p> <p> </p> </div> <br></br> <h3>Why play this game?</h3> <p><a href="http://nrich.maths.org/public/viewer.php?obj_id=1235">This game</a> provides an engaging way to estimate angles. Instant feedback enables students to improve their estimation skills.</p> <br></br> <br></br> <h3>Possible approach</h3> <p>Ask students what they know about angles around a point. Draw out names of angles (acute, obtuse, reflex, right-angled) and landmark angles (90 degrees, 180 degrees, 270 degrees, 360 degrees).<br></br> <br></br> Draw acute, obtuse and reflex angles on the board and ask students to estimate their size. Encourage justification for estimates.<br></br> <br></br> Draw another five angles on the board and challenge the class to make better estimates than you can. One person from the class estimates an angle, followed by you. Measure the angle with a protractor. The closest estimate gains a point. Repeat for the other four angles.<br></br> <br></br> Demonstrate the interactivity with "One Player" at Level 2 before setting the group off to work in pairs. The challenge is to score more than 50 points in 10 goes. Keep a record of the highest score on the board. How close to 100 points can any pair get? This could be a long-term challenge.<br></br> <br></br> Pairs move on to Level 3 when appropriate.<br></br> <br></br> Towards the end of the lesson the highest scoring pair can challenge you to a game.<br></br>  </p> <h3>Key questions</h3> <p>What angles are easy to draw?<br></br> What strategies can you use to improve your estimates?<br></br>  </p> <h3>Possible extension</h3> <p>Pairs play the "Two Player" version of the game.<br></br>  </p> <h3>Possible support</h3> <p>Start on Level 1. Allow students to look at a protractor.</p></mdoxml> 2 3 0 1 1 0 0 How good are you at estimating angles? Using, Applying and Reasoning about Mathematics Games 2D Geometry, Shape and Space Angles Secondary Mapping Document Units of measurement Secondary Mapping Document DisplayCabinet