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How to Remember and use Roman Numerals
My 4 yr old brought home a roman numerals sheet today and immediately I thought about how much my 3rd and 4th graders love to write numbers in the "code" of roman numerals.
First is the basics. These are the basic numbers in the roman system. The numbers are represented by letters from the Latin alphabet.
There are several things that the students get confused about when writing in roman numerals. The combination of how the symbols are put together determine the number. When a smaller number is placed in front of a larger number it means to subtract that number from the larger number when it is placed to the right that you add the number together.
How to remember the Roman Numerals beyond I, V, X
The mnemonic device helps my students remember the order of the rest of the Roman Numerals. Also remember that the numbers only occur with the lead digit being 1 or 5.
The Roman system includes the number 5, 10, 50, 100, 500, 100, etc
How to use Roman Numerals
I = 1
II = 2
III = 3
IV = 4 - notice that the I before the V means 5 - 1 = 4
V = 5
VI = 6
VII = 7
VIII = 8
IX = 9
X = 10
A few more examples
VL = 45, 5 before the 50 means to subtract
IC = 99
MCL = 1000 + 100 + 50 = 1150
DIL = 500 + (50-1) = 549