]]>
LearnNext
Get a free home demo of LearnNext

Available for CBSE, ICSE and State Board syllabus.
Call our LearnNext Expert on 1800 419 1234 (tollfree)
OR submit details below for a call back

clear

Roman Numerals

92,607 Views
Have a doubt? Clear it now.
live_help Have a doubt, Ask our Expert Ask Now
format_list_bulleted Take this Lesson Test Start Test

Roman Numerals - Lesson Summary

Hindu – Arabic number system:

Many years ago, Hindus and Arabs developed a number system called the Hindu–Arabic number system. It is the name given to the number system that we use today.

Roman numerals:

It is the numeral system that originated in ancient Rome. This numeral system is based on certain letters, which are given values and are used as numerals. The following are the seven number symbols used in the Roman numeral system, and their values: 

Symbols          I      V      X      L      C        D         M Value          1      5      10      50      100       500        1000

Seven letters of English alphabet, i.e. I, V, X, L, C, D and M, are used to represent Roman numerals.  Roman numerals do not have a symbol for zero. Roman numerals are read from left to right, and are arranged from the largest to the smallest. Multiplication,division and other complex operations were difficult to perform on Roman numerals. So Hindu-Arabic numerals were used. The Roman numerals are used in some clocks.

The Roman numerals for the numbers 1 - 15 are shown below:

 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  I  II  III  IV  V  VI  VII  VIII  IX   X  XI  XII  XIII  XIV  XV


Rules for Roman numerals:

  • In Roman numerals, a symbol is not repeated more than thrice. If a symbol is repeated, its value is added as many times as it occurs. For example, if the letter I is repeated thrice, then its value is three.
  • The symbols V, L and D are never repeated.
  • If a symbol of smaller value is written to the right of a symbol of greater value, then its value gets added to the symbol of greater value. For example, in case of VI, I is written to the right of V. It means that 1 should be added to 5. Hence, its value is 6.
  • If a symbol of smaller value is written to the left of a symbol of greater value, then its value is subtracted from the symbol of greater value. For example, in case of IV, I is written to the left of V.  It means that 1 should be subtracted from 5.  Hence, its value is 4. 
  • The symbols V, L and D are never written to the left of a symbol of greater value, so V, L and D are never subtracted. For example, we write 15 as XV and not VX.
  • The symbol I can be subtracted from V and X only. For example, the value of IV is four and the value of IX is nine. 
  • The symbol X can be subtracted from L, M and C only. For example, X is subtracted from L to get 40, which is represented by XL.
  • If a symbol of smaller value is written between the symbols of greater value, then its value is subtracted from the symbol of the greater value which is wriiten immediately after the symbol of the smaller value. For example the value of XIV is 10 + (5 – 1) i.e. 14.
  • If bar is written over a symbol, it's value gets multiplied by 1000. For example, the value of  V _ is 5 × 1000 i.e. 5000.

Comments(0)

Feel the LearnNext Experience on App

Download app, watch sample animated video lessons and get a free trial.

Desktop Download Now
Tablet
Mobile
Try LearnNext at home

Get a free home demo. Book an appointment now!

GET DEMO AT HOME