Roman numerals – upper primary mathematics

Roman numerals – upper primary mathematics

Roman numerals

The table below equivalent of roman numerals to Arabic numeral

1 2 3 4 5 6 7 8 9
I II III IV V VI VII VII IX
10 20 30 40 50 60 70 80 90
X XX XXX XL L LX LXX LXX XC
100 200 300 400 500 600 700 800 900
C CC CCC CD D DC DCC DCC CM
1000 2000 3000
M MM MMM

 

Examples

  1.   39 = XXX + IX = XXXIX.
  2.  246 = CC + XL + VI = CCXLVI.
  3.  789 = DCC + LXXX + IX = DCCLXXXIX.
  4. 2,421 = MM + CD + XX + I = MMCDXXI.
  5. 160 = C + LX = CLX
  6. 207 = CC + VII = CCVII
  7. 1,009 = M + IX = MIX
  8. 1,066 = M + LX + VI = MLXVI

Examples writing years in Roman numbers

  • 1776 = M + DCC + LXX + VI = MDCCLXXVI
  • 1918 = M + CM + X + VIII = MCMXVIII
  • 1954 = M + CM + L + IV = MCMLIV
  • 2014 = MM + X + IV = MMXIV
  • 3,999 = MMM + CM + XC + IX = MMMCMXCIX

Common question require a student to change Arabic to Roman numeral and vice versa.

Examples

  1. Write XXIV in Hindu Arabic numerals.

Solution

XXIV = 20 + 4 = 24

  1. Write 79 in Roman numerals

79 = 70 + 9

LXX + IX

LXXIX

Exercise

  1. Write the following Roman number into Hundu Arabic numeral
    • XLI
    • LVI
    • LXXXII
    • CLXXIV
    • MI
  2. Write the following figures in Roman numeral
    • 99
    • 121
    • 26
    • 14
    • 294

 

 

Solution

  1. Write the following Roman number into Hundu Arabic numeral
    • XLI = 40 + 1 = 41
    • LVI = 50 + 6 = 56
    • LXXXII = 70 + 2 = 72
    • CLXXIV= 100 + 20 + 4 = 124
    • MI = 1000 + 1 = 1001
  2. Write the following figures in Roman numeral
    • 99 = XC + IX = XCIX
    • 121= C + XX + I = CXXI
    • 26 = X + VI = XVI
    • 14 = X + IV = XIV
    • 294 = CC + XC + IV = CCXCIV

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