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01 Introduction to Mathematics | R
Many students wonder why it's even necessary to learn in the first place. How social media knows who you're going to tag in a photo before you do.
http://qindex.info/d.php?c=4816#4817

01 Place Value | R
Math Antics - Place Value
http://qindex.info/d.php?c=4816#5134

02 Addition and Subtraction of Small Numbers | R
Addition and Subtraction of Small Numbers
http://qindex.info/d.php?c=4816#4818

02 Decimal Place Value | R
Math Antics - Decimal Place Value
http://qindex.info/d.php?c=4816#5135

03 Multiplication and Division of Small Numbers | R
Multiplication and Division of Small Numbers
http://qindex.info/d.php?c=4816#4819

03 What Is Arithmetic? | R
Math Antics - What Is Arithmetic?
http://qindex.info/d.php?c=4816#5136

04 Fractions, Improper Fractions, and Mixed Numbers | R
Understanding Fractions, Improper Fractions, and Mixed Numbers
http://qindex.info/d.php?c=4816#4820

04 Order Of Operations | R
Math Antics - Order Of Operations
http://qindex.info/d.php?c=4816#5137

05 Factoring | R
Math Antics - Factoring
http://qindex.info/d.php?c=4816#5138

05 Large Whole Numbers: Place Values and Estimating | R
Large Whole Numbers: Place Values and Estimating
http://qindex.info/d.php?c=4816#4821

06 Decimals: Notation and Operations | R
Decimals: Notation and Operations
http://qindex.info/d.php?c=4816#4822

06 Prime Factorization | R
Math Antics - Prime Factorization
http://qindex.info/d.php?c=4816#5139

07 Multi-Digit Addition | R
Math Antics - Multi-Digit Addition
http://qindex.info/d.php?c=4816#5140

07 Working With Percentages | R
Working With Percentages
http://qindex.info/d.php?c=4816#4823

08 Converting Between Fractions, Decimals, and Percentages | R
Converting Between Fractions, Decimals, and Percentages
http://qindex.info/d.php?c=4816#4824

08 Multi-Digit Subtraction | R
Math Antics - Multi-Digit Subtraction
http://qindex.info/d.php?c=4816#5141

09 Addition and Subtraction of Large Numbers | R
Addition and Subtraction of Large Numbers
http://qindex.info/d.php?c=4816#4825

09 Multi-Digit Multiplication Pt 1 | R
Math Antics - Multi-Digit Multiplication Pt 1
http://qindex.info/d.php?c=4816#5142

10 Multi-Digit Multiplication Pt 2 | R
Math Antics - Multi-Digit Multiplication Pt 2
http://qindex.info/d.php?c=4816#5143

10 The Distributive Property | R
The Distributive Property for Arithmetic
http://qindex.info/d.php?c=4816#4826

11 Basic Division | R
Math Antics - Basic Division
http://qindex.info/d.php?c=4816#5144

11 Multiplication of Large Numbers | R
Multiplication of Large Numbers
http://qindex.info/d.php?c=4816#4827

12 Division of Large Numbers | R
Division of Large Numbers: Long Division
http://qindex.info/d.php?c=4816#4828

12 Long Division | R
Math Antics - Long Division
http://qindex.info/d.php?c=4816#5145

13 Long Division with 2-Digit Divisors | R
Math Antics - Long Division with 2-Digit Divisors
http://qindex.info/d.php?c=4816#5146

13 Negative Numbers | R
Negative Numbers
http://qindex.info/d.php?c=4816#4829

14 Decimal Arithmetic | R
Math Antics - Decimal Arithmetic
http://qindex.info/d.php?c=4816#5150

14 Understanding Exponents and Their Operations | R
Understanding Exponents and Their Operations
http://qindex.info/d.php?c=4816#4830

15 Order of Arithmetic Operations: PEMDAS | R
Order of Arithmetic Operations: PEMDAS
http://qindex.info/d.php?c=4816#4831

15 The Distributive Property In Arithmetic | R
The Distributive Property In Arithmetic
http://qindex.info/d.php?c=4816#5151

16 Divisibility, Prime Numbers, and Prime Factorization | R
The fundamental theorem of arithmetic: there is only one unique set of prime factors for any number.
http://qindex.info/d.php?c=4816#4832

16 Mean, Median and Mode | R
Math Antics - Mean, Median and Mode
http://qindex.info/d.php?c=4816#5152

17 Least Common Multiple (LCM) | R
Least Common Multiple (LCM)
http://qindex.info/d.php?c=4816#4833

17 Negative Numbers | R
Math Antics - Negative Numbers
http://qindex.info/d.php?c=4816#5153

18 Adding & Subtracting Integers | R
Math Antics - Adding & Subtracting Integers
http://qindex.info/d.php?c=4816#5154

18 Greatest Common Factor (GCF) | R
Greatest Common Factor (GCF)
http://qindex.info/d.php?c=4816#3761

19 Addition and Subtraction of Fractions | R
Addition and Subtraction of Fractions
http://qindex.info/d.php?c=4816#3762

19 Integer Multiplication & Division | R
Math Antics - Integer Multiplication & Division
http://qindex.info/d.php?c=4816#5155

20 Intro To Exponents (aka Indices) | R
Multiplication shows repeated addition and exponents show repeated multiplication.
http://qindex.info/d.php?c=4816#5066

20 Multiplication and Division of Fractions | R
Multiplication and Division of Fractions
http://qindex.info/d.php?c=4816#3764

21 Analyzing Sets of Data: Range, Mean, Median, and Mode | R
The median and the mode dilute the impact of anomalous data.
http://qindex.info/d.php?c=4816#4938

21 Exponents & Square Roots | R
Math Antics - Exponents & Square Roots
http://qindex.info/d.php?c=4816#5067

22 Rounding | R
Math Antics - Rounding
http://qindex.info/d.php?c=4816#5068

23 Basic Probability | R
Math Antics - Basic Probability
http://qindex.info/d.php?c=4816#5069

Numbers, Numerals and Digits | R
Numbers, Numerals and Digits
http://qindex.info/d.php?c=4816#5165

Roman Numerals | R
The Romans showed numbers into the thousands using these 7 symbols: I for 1, V for 5, X for 10, L for 50, C for 100, D for 500 and M for 1000.
http://qindex.info/d.php?c=4816#5038
/* Regular Expression
M{1,3}
((C{1,3})([^DM]|$))|(CD)|(DC{0,3})|(CM)
((X{1,3})([^LC]|$))|(XL)|(LX{0,3})|(XC)
((I{1,3})([^VX]|$))|(IV)|(VI{0,3})|(IX)
*/

// Javascript
function 2arabic(c) {
    switch(c) {
        case 'I': return    1; break;
        case 'V': return    5; break;
        case 'X': return   10; break;
        case 'L': return   50; break;
        case 'C': return  100; break;
        case 'D': return  500; break;
        case 'M': return 1000; break;
    }
}

var roman = 'MCMLXVIII';
var arabic = 0;
var previous = 0;
var current = 0;
for(i=0; i<roman.length; i++) {
    current 
        = 2arabic(roman.charAt(i));
    if(previous && previous<current) 
        arabic -= previous;
    else arabic += previous;
    previous = current;
}
arabic += current;
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