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<!DOCTYPE html>
<html data-require="math graphie word-problems interactive">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Number line</title>
<script src="../khan-exercise.js"></script>
</head>
<body>
<div class="exercise">
<div class="vars">
<var id="LOWER_BOUND">-5</var>
<var id="UPPER_BOUND">-1 * LOWER_BOUND</var>
<var id="NUMBER">randRangeNonZero( LOWER_BOUND, UPPER_BOUND )</var>
</div>
<div class="problems">
<div>
<div class="question">
<p>Drag the orange dot to <strong><var>NUMBER</var></strong>. The distance between adjacent tick marks is 1.</p>
<div class="graphie" id="number-line">
init({
range: [ [LOWER_BOUND - 1, UPPER_BOUND + 1], [-1, 1] ]
});
line( [ LOWER_BOUND, 0 ], [ UPPER_BOUND, 0 ] );
for ( var x = LOWER_BOUND; x &lt;= UPPER_BOUND; x++ ) {
line( [ x, -0.2 ], [ x, 0.2 ] );
}
style({ stroke: "#6495ED", strokeWidth: 3.5 });
line( [ 0, -0.2], [0, 0.2]);
label( [ 0, -0.53 ], "0", "center", { color: "#6495ED" });
addMouseLayer();
this.movablePoint = addMovablePoint({ constraints: { constrainY: true }, snapX: 0.25 });
movablePoint.onMove = function( x, y ) {
if (x &lt; LOWER_BOUND || UPPER_BOUND &lt; x) {
return false; // don't allow the point to move past the bounds
}
jQuery("#solutionarea input").val( x );
};
</div>
</div>
<div class="solution" data-type="multiple">
<span>Move the orange dot to select your answer.</span>
<div class="sol" data-type="decimal" style="display:none"><var>NUMBER</var></div>
</div>
<div class="hints">
<p>We know where 0 is on the number line because it is labeled.</p>
<p>Numbers to the left are smaller, and numbers to the right are bigger.</p>
<p>Numbers smaller than 0 are negative, and numbers bigger than 0 are positive.</p>
<div>
<div class="graphie" data-update="number-line">
style({ stroke: "#6495ED", fill: "#6495ED", strokeWidth: 3.5, arrows: "-&gt;" });
line( [ 0, 0 ], [ NUMBER, 0 ] );
movablePoint.visibleShape.toFront();
</div>
<p>The orange dot should be <var>plural( abs( NUMBER ), "position")</var> to the <span data-if="NUMBER &lt; 0">left</span><span data-else>right</span> of 0.</p>
</div>
<div>
<div class="graphie" data-update="number-line">
label( [ NUMBER, -0.53 ], NUMBER, "center", { color: "#FFA500" });
movablePoint.moveTo( NUMBER, 0 );
</div>
<p>The orange number shows where <var>NUMBER</var> is on the number line.</p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
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