Roman Numerals

Roman numerals were originated in ancient Rome to calculate the numbers and values.

The number system we are using is Hindu-Arabic Numeral System.

 

How To Read Roman Numerals

Once you remember these seven symbols , reading roman numerals is very easy.

Have a look on roman numerals from 1-10.

 

Maths class 4 Roman numerals

 

If a symbol is repeated, its value increased as many times as it occurs, but the same symbol cannot be used more than 3 times.

 

Example: I = 1, II=2, III = 3

                 X = 10, XX = 20, XXX = 30

 

Did you observe that we cannot use the same symbol more than 3 times?

There is no numeral value for zero.

 

So, there are seven basic symbols that we use to read and write roman numerals:

 

Maths class 4 Roman numerals

 

 

How to Write Other Numbers?

 

If a symbol of lower value is written to the left of greater value symbol, then its value is subtracted from the value of the greater symbol.

Maths class 4 Roman numerals

If a symbol of greater value is written to the left of lower value symbol, then their values are added.

Maths class 4 Roman numerals

 

Practice Exercise

Write the Roman Numerals for following numbers:

  • 6
  • 28
  • 39
  • 50
  • 64

Answers: 1) VI   2) XXVIII   3) XXXIX   4) L   5) LXIV

 

Write the numbers for following:

  • VII
  • XIV
  • XXIX
  • XLIX
  • C

Answers: 1) 7   2) 14   3) 29   4) 49   5) 100

 

Match the Roman Numerals with Numbers:

V

60

XII

30

LX

104

CIV

5

XXX

12

 

Answers

V

5

XII

12

LX

60

CIV

104

XXX

30

 

 

Recap

 

  • Roman numerals are represented with symbols.
  • There is no roman numeral for zero.
  • We cannot use same symbol more than 3 times.
  • Important symbols: V=5, X=10, L=50, C=100, D=500, M=1000