Maths Made Easy: Roman Numerals 2

Previously we established an easier way to know letters of Roman Numerals using mnemonics here

We will be considering the guidelines that will help us compute figures.

Rome Rules

1. Letters can only be repeated twice or thrice I.e. you can only have twins and triplets. Examples: 2- II, 3-III, 20- XX, 30- XXX
2. There’s no zero in Roman numerals
3. When you subtract, the letter with a lower value moves to the LHS (Left Hand Side)Examples; 5-1= 4 since you’re subtracting, take I to the LHS and V to the RHS to have IV. Do same for 40 and 400  Same strategy applies to 9. 10-1=9 Place I on the LHS and X on the RHS to have IX . Do same for 90 and 900
4. When you add, the letter with a higher value moves to the RHS (Right Hand Side). Examples; 5+1=6 since you’re aadding, take I to the RHS to have VI. Do same for 60 and 600. .
5. Combine rule 1 & 4 to form 7 and 8. That is, add the letters and repeat it. 5+1+1=7, V+I+I= VII. 5+1+1+1=8 is V+I+I+I= VIII. Follow the same process for 70, 80, 700 and 800
6. When there’s a dash on a letter, it represents 1000 multiplied by the value of the letter.