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1. Addition. The system is based off addition. Instead of a separate number for everything, the Romans would add everything together.

2. Subtraction. When a symbol of a smaller number value is in front, it is subtracted from the larger number behind it. (IV = Four. XC = Ninety)

3. Symbols. I = one. V = five. X = ten. L = fifty. C = hundred. D = five hundred. M = thousand.

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