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Rules for Forming Roman Numbers
Last updated at November 19, 2025 by Teachoo
Roman Numerals
Roman Numerals
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Class 8 (Ganita Prakash & Old NCERT)
Chapter 3 Class 8 - A Story of Numbers (Ganita Prakash)
- Introduction
- The Mechanism of Counting
- Some Early Number Systems
-
Roman Numerals
- Figure it out - Page 60, 61
- Egyptian Number System
- Variations on the Egyptian System and the Notion of Base
- Adding Egyptian Numerals
- Multiplying Egyptian Numerals
- Distributive Law – For Egyptian Numerals
- Abacus that Makes Use of the Decimal System
- Shortcomings of the Egyptian System
- Figure it out - Page 69
- Mesopotamian Number System
- Mayan Number System
- Chinese Number System
- Hindu Number System
- Evolution of Ideas in Number Representation
- Figure it out - Page 80
Transcript
Rules for Forming Roman Numbers If symbol is repeated, it’s value is added Example II = I + I = 1 + 1 = 2 XXX = X + X + X = 10 + 10 + 10 = 30 b) No symbol is repeated more than 3 times III is allowed IIII is not allowed Note: V, L, D are never repeated. c) If smaller value symbol is written to right of greater value symbol, its value gets added. VI = V + I = 5 + 1 = 6 XII = X + I + I = 10 + 1 + 1 = 12 LXV = L + X + V = 50 + 10 + 5 = 65 d) If the symbol of smaller value is written to the left of greater value, its value gets subtracted IV = V − I = 5 − 1 = 4 IX = X − I = 10 − 1 = 9 XL = L − X = 50 − 10 = 40 XC = C − X = 100 − 10 = 90
