write all the five rules for writing Roman numerals with example.
Answers
Answer:
Look at the bottom of the cover page of your textbook. It says-‘ Textbook for class VI’. This numeral VI is 6 in the Hindu-Arabic system. Likewise, if we look around we can spot various Roman numerals. Many watches have numbers written in Roman numerals. Thus although Hindu-Arabic numerals are most widely used, the Roman numerals often appear in our daily lives.
Some basic Roman numerals are:
1→ I 10→X C→100
2→ II 20→XX D→500
3→ III 30→XXX M→1000
4→ IV 40→XL
5→ V 50→L
6→VI 60→LX
7→VII 70→LXX
8→VIII 80→LXXX
9→IX 90→XC
Answer:
Rules for Formation of Roman-numerals:
Rule 1: The roman digits I, X and C are repeated upto three times in succession to form the numbers.
Rule 2: (a) When a digit of lower value is written to the right or after a digit of higher value, the values of all the digits are added.
(b) Value of similar digits are also added as indicated in rule 1
Rule 3: When a digit of lower value is written to the left or before a digit of higher value, then the value of the lower digit is subtracted from the value of the digit of higher value.
Rule 4: (a) If we have to write the numbers beyond 10 we should write the number 10 or groups of number 10 and then number 1 or 5 as the case may be. Then these numbers are used to change to the corresponding Roman numerals.
Rule 5: If a horizontal line is drawn over the symbols or digits of Roman numerals, then the value of the numerals becomes 1000 times.
Examples :
12 = 10 + 2 = 1 0 + 1 + 1 = XII
20 = 10 + 10 = XX
22 = 10 + 10 +1 + 1= XXII
26 = 10 + 10 + 5 + 1 = XXVI