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addition_4.html
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/
addition_4.html
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<!DOCTYPE html>
<html data-require="math graphie graphie-helpers-arithmetic">
<head>
<meta charset="UTF-8" />
<title>Addition 4</title>
<script src="../khan-exercise.js"></script>
</head>
<body>
<div class="exercise">
<div class="vars">
<var id="A">randRange( 1000, 9999 )</var>
<var id="B">randRange( 1000, 9999 )</var>
<var id="A_DIGITS">digits( A )</var>
<var id="B_DIGITS">digits( B )</var>
<var id="CARRY">0</var>
<var id="HIGHLIGHTS">[]</var>
<var id="Y_CARRY">3</var>
<var id="Y_FIRST">2</var>
<var id="Y_SECOND">1</var>
<var id="Y_SUM">0</var>
<var id="X_MAX">4</var>
<var id="X_SIDE">6</var>
<var id="Y_SIDE">1.5</var>
</div>
<div class="problems">
<div>
<div class="graphie" id="numbers">
init({
range: [ [ -1, 11 ], [ -0.5, 3.5 ] ],
scale: [30, 45]
});
drawDigits( A_DIGITS.slice( 0 ).reverse(), X_MAX - A_DIGITS.length + 1, Y_FIRST );
drawDigits( B_DIGITS.slice( 0 ).reverse(), X_MAX - B_DIGITS.length + 1, Y_SECOND );
path( [ [ -0.5, Y_SECOND - 0.5 ], [ X_MAX + 0.5, Y_SECOND - 0.5 ] ]);
label( [ 0, 1 ] ,"\\huge{+\\vphantom{0}}" );
</div>
<div class="solution" data-forms="integer"><var>A + B</var></div>
</div>
</div>
<div class="hints">
<div class="graphie" data-update="numbers" data-each="A_DIGITS as index, value">
while( HIGHLIGHTS.length ) {
HIGHLIGHTS.pop().remove();
}
var index = <var>index</var>;
var prevCarry = CARRY;
var prevCarryStr = "";
var carryStr = "";
var addendStr = "";
var sum;
if ( prevCarry !== 0 ) {
HIGHLIGHTS.push( label( [ X_MAX - index, Y_CARRY ], "\\color{#6495ED}{" + prevCarry + "}", "below" ) );
prevCarryStr = "\\color{#6495ED}{" + prevCarry + "} + ";
}
sum = A_DIGITS[ index ] + CARRY;
HIGHLIGHTS.push( label( [ X_MAX - index, Y_FIRST ],
"\\Huge{\\color{#6495ED}{" + A_DIGITS[ index ] + "}}" ) );
if ( index < B_DIGITS.length ) {
HIGHLIGHTS.push( label( [ X_MAX - index, Y_SECOND ],
"\\Huge{\\color{#6495ED}{" + B_DIGITS[ index ] + "}}" ) );
addendStr = " + \\color{#6495ED}{" + B_DIGITS[ index ] + "}";
sum += B_DIGITS[ index ];
}
label( [ X_MAX - index, 0 ], "\\Huge{" + sum % 10 + "}");
HIGHLIGHTS.push( label( [ X_MAX - index, Y_SUM ],
"\\Huge{\\color{#28AE7B}{" + sum % 10 + "}}" ) );
CARRY = floor( sum / 10 );
if ( CARRY !== 0 ) {
HIGHLIGHTS.push( label( [ X_MAX - index - 1, Y_CARRY ],
"\\color{#FFA500}{" + CARRY + "}", "below" ) );
carryStr = "\\color{#FFA500}{" + CARRY + "}";
}
HIGHLIGHTS.push( label( [ X_SIDE, Y_SIDE ], "\\Large{"
+ prevCarryStr
+ "\\color{#6495ED}{" + A_DIGITS[ index ] + "}"
+ addendStr
+ " = "
+ carryStr
+ "\\color{#28AE7B}{" + sum % 10 + "}"
+ "}", "right" ) );
</div>
<div data-if="A + B > 9999">
<div class="graphie" data-update="numbers">
while( HIGHLIGHTS.length ) {
HIGHLIGHTS.pop().remove();
}
HIGHLIGHTS.push( label( [ 0, Y_CARRY ],
"\\color{#6495ED}{" + CARRY + "}", "below" ) );
label( [ 0, Y_SUM ], "\\Huge{" + CARRY + "}" );
HIGHLIGHTS.push( label( [ 0, Y_SUM ],
"\\Huge{\\color{#28AE7B}{" + CARRY + "}}" ) );
HIGHLIGHTS.push( label( [ X_SIDE, Y_SIDE ],
"\\Large{"
+ "\\color{#6495ED}{" + CARRY + "}"
+ " = "
+ "\\color{#28AE7B}{" + CARRY + "}"
+ "}", "right" ) );
</div>
</div>
<div class="graphie" data-update="numbers">
while( HIGHLIGHTS.length ) {
HIGHLIGHTS.pop().remove();
}
</div>
</div>
</div>
</body>
</html>