# Khan/khan-exercises

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 Number line
0 10 randRangeNonZero( LOWER_BOUND, UPPER_BOUND )

Drag the orange dot to NUMBER. The distance between tick marks is 1.

init({ range: [[LOWER_BOUND - 1, UPPER_BOUND + 1], [-1, 1]] }); line([LOWER_BOUND, 0], [UPPER_BOUND, 0]); for (var x = LOWER_BOUND; x <= 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(); graph.movablePoint = addMovablePoint({ constraints: { constrainY: true } }); graph.movablePoint.onMove = function( x, y ) { var newx = round(x); if (abs(newx - x) < 0.25) { x = newx; } return [min(max(LOWER_BOUND, x), UPPER_BOUND), y]; };
graph.movablePoint.coord[0]
if (guess === 0) { return ""; } return abs(NUMBER - guess) < 0.001;
graph.movablePoint.setCoord([guess, 0]);

We know where 0 is on the number line because it is labeled.

As you move to the right, the numbers get bigger.

style({ stroke: "#6495ED", fill: "#6495ED", strokeWidth: 3.5, arrows: "->" }); line([0, 0], [NUMBER, 0]); graph.movablePoint.visibleShape.toFront();

The orange dot should be plural(abs(NUMBER), "tick mark") to the leftright of 0.

label([NUMBER, -0.53], NUMBER, "center", {color: "#FFA500"}); graph.movablePoint.moveTo(NUMBER, 0);

The orange number shows where NUMBER is on the number line.

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