I =

1- You use I for 3 ones, then you use the roman numeral explanation for subtraction

  V=

5- There will be only one V in a number (if there is one) because 2 V’s is ten which is…

  X=

10- If you look closely in the X you’ll see two V’s.  5+5=10.

  L=

50- To remember L is 50 you can think of an XL size.  10 or X * 5 = 50 or L.

  C=

100- C stands for centrum, or latin for 100.

  D=

500- You can remember D as 50 by adding the curved side of a 0 to the L of 50 to get D.

  M=

1000- M is for mili___.  This is the prefix that means 1000.

  V

You add a horizontal line to a letter to add to additional zeros to make the number larger.

SUBTRACTION

The subtraction explanation for the Romans is a smaller # in front of a larger # means to subtract that place value.  Example: IV = 4

 SUMMARY

Roman numerals were very important to the Romans.  Without it, the Romans wouldn’t be as well known of their cleverness because numbers lead us to so many other things.  This might sound simple but things like counting, addition, subtraction, multiplication, and division are things led by numbers.