Search


More polls

Kids Math

Roman Numerals

Skills needed:
Multiplication
Addition
Subtraction

Roman numerals were used by the Ancient Romans as their numbering system. We still use them sometimes today. You see them in the Super Bowl's numbering system, after king's names (King Henry IV), in outlines, and other places. Roman numerals are base 10 or decimal, like the numbers we use today. They are not entirely positional, however, and there is no number zero.

Roman numerals use letters instead of numbers. There are seven letters you need to know: You put the letters together to make numbers. Here are a few simple examples:

1) III = 3

three I's together is three 1's and 1 + 1 + 1 equals 3

2) XVI = 16

10 + 5 + 1 = 16

These examples were simple, but there are a few rules and a few tricky things to know when using Roman numerals:
  1. The first rule just says that you add letters, or numbers, if they come after a bigger letter or number. We demonstrated this in example 2 above. The V is less than the X, so we added it to the number. The I was less than the V, so we added it to the number. We'll discuss what happens when a letter of greater value comes after a letter of lesser value in rule 3.
  2. The second rule is that you can't put more than three letters together in a row. For example, you can put three I's together, III, to make a 3, but you can't put four I's together, IIII, to make a four. How do you make a 4 then? See rule number three.
  3. You can subtract a number by putting a letter of lower value before one of higher value.
  4. This is how we make the numbers four, nine, and ninety: There are a few restrictions on when you can do this:
  5. The last rule is that you can put a bar over a number to multiply it by a thousand and make a really big number.
Examples:

The numbers 1 through 10:

I, II, III, IV, V, VI, VII, VIII, IX, X

The tens (10, 20, 30, 40, 50, 60, 70. 80, 90, 100):

X, XX, XXX, XL, L, LX, LXX, LXXX, XC, C



Advanced Kids Math Subjects

Multiplication
Intro to Multiplication
Long Multiplication
Multiplication Tips and Tricks

Division
Intro to Division
Long Division
Division Tips and Tricks

Fractions
Intro to Fractions
Equivalent Fractions
Simplifying and Reducing Fractions
Adding and Subtracting Fractions
Multiplying and Dividing Fractions

Decimals
Decimals Place Value
Adding and Subtracting Decimals
Multiplying and Dividing Decimals
Statistics
Mean, Median, Mode, and Range
Picture Graphs

Algebra
Order of Operations
Exponents
Ratios
Ratios, Fractions, and Percentages

Geometry
Polygons
Quadrilaterals
Triangles
Pythagorean Theorem
Circle
Perimeter
Surface Area

Misc
Basic Laws of Math
Prime Numbers
Roman Numerals
Binary Numbers


Back to Kids Math

Back to Kids Study








About Ducksters  Link to Ducksters  Teachers Privacy Policy

Last updated: This site is a product of TSI (Technological Solutions, Inc.), Copyright 2014, All Rights Reserved. By using this site you agree to the Terms of Use.

To cite this article using MLA style citation: