shuffle([1, 2, 3, 4, 5, 6, 7, 8, 9]).slice( 0, 4 )
digitsToInteger( DIGITS )
randRange( 0, 3 )
DIGITS[POWER]
(function() {
var maxPower = DIGITS.length - 1;
var products = $.map( DIGITS, function( digit, index ){
return "(" + digit + "\\times" + pow(10, maxPower - index) + ")";
});
return products.join( "+" );
})()
(function() {
var maxPower = DIGITS.length - 1;
var words = $.map( DIGITS, function( digit, index ) {
var value = powerToPlace( maxPower - index );
return "<code>" + digit + "</code> " +
KhanUtil.plural(value, digit);
});
return words.join(" <code>+</code> ");
})()
(function() {
var places = placesLeftOfDecimal.slice( 0, 4 );
return $.map( places, function( place, i ) {
return place + "s";
});
})()
PLACES[ DIGITS.length - 1 - POWER ]
What is the place value of DIGIT in NUMBER?
capitalize(SOLUTION)
NUMBER can be represented as follows.
= HINT_IN_NUMBERS
= HINT_IN_WORDS
Thus, DIGIT is in the SOLUTION place.
randRange( 0, 9, 4 )
digitsToInteger( DIGITS )
[ ]
(function() {
var maxPower = DIGITS.length - 1;
return $.map(DIGITS, function(digit, index) {
if ( digit === 0 ) {
return null;
}
var addend;
if ( index === DIGITS.length - 1 ) {
if ( DIGITS[ index - 1] === 0 ) {
ADDENDS.push( digit );
return Cardinal( digit ) + " is the same as <code>" +
digit + "</code>";
}
} else if ( index === DIGITS.length - 2 ) {
addend = digit * 10 + DIGITS[ DIGITS.length - 1 ];
ADDENDS.push( addend );
return Cardinal( addend ) + " is the same as <code>" +
addend + "</code>";
} else {
var words = Cardinal( digit ) + " " + powerToPlace(maxPower - index);
var placeValue = pow(10, maxPower - index);
ADDENDS.push( digit * placeValue);
return words + " is the same as <code>" +
digit + "\\times" + placeValue + " = " +
(digit * placeValue) + "</code>";
}
});
})()
Rewrite cardinal( NUMBER ) in numerals.
NUMBER
hint
Add all these parts up:
ADDENDS.join( " + " )
= NUMBER