# Understanding Roman Numerals

Tiffany is very interested in the past and loves learning about different historical periods. She likes to wear the clothes of the period she is learning about.

Tiffany has been learning about Roman Numerals and has discovered many interesting facts.

Did you know –

he Romans did not have numbers so they used seven letters to represent numbers.

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

There is no 0 in Roman numerals

Roman numerals are still used today and are often seen on clocks or watches

### What are the Roman Numerals for 1 – 100?

 1 2 3 4 5 I II III IV V 6 7 8 9 10 VI VII VIII IX X 11 12 13 14 15 XI XII XIII XIV XV 16 17 18 19 20 XVI XVII XVIII XIX XX 21 22 23 24 25 XXI XXII XXIII XXIV XXV 26 27 28 29 30 XXVI XXVII XXVIII XXIX XXX 31 32 33 34 35 XXXI XXXII XXXIII XXXIV XXXV 36 37 38 39 40 XXXVI XXXVII XXXVIII XXXIX XL 41 42 43 44 45 XLI XLII XLIII XLIV XLV 46 47 48 49 50 XLVI XLVII XLVIII XLIX L 51 52 53 54 55 LI LII LIII LIV LV 56 57 58 59 60 LVI LVII LVIII LIX LX 61 62 63 64 65 LXI LXII LXIII LXIV LXV 66 67 68 69 70 LXVI LXVII LXVIII LXIX LXX 71 72 73 74 75 LXXI LXXII LXXIII LXXIV LXXV 76 77 78 79 80 LXXVI LXXVII LXXVIII LXXIX LXXX 81 82 83 84 85 LXXXI LXXXII LXXXIII LXXXIV LXXXV 86 87 88 89 90 LXXXVI LXXXVII LXXXVIII LXXXIX XC 91 92 93 94 95 XCI XCII XCIII XCIV XCV 96 97 98 99 100 XCVI XCVII XCVIII XCIX C 200 300 400 500 600 CC CCC CD D DC 700 800 900 1000 DCC DCCC CM M

### What are the special rules for 4, 6, 9 and 11

There are special rules when dealing with certain numbers:

4 – the Roman Numeral is IV – the letter I before the V means 1 has to be subtracted

6 – the Roman Numeral is VI – the letter I after the V means that 1 has to be added

9 – the Roman Numeral is IX – the letter I before the X means that it has to be subtracted

11 – the Roman Numeral is XI – the letter I after the X means that it has to be added

Other letters can be added or subtracted in a similar way:

40 – the Roman Numeral is XL – the X is before the L so 10 has to be subtracted from 50

900 – the Roman Numeral is CM – the C is before the M so 100 has to be subtracted from 1000

600 – the Roman Numeral is DC – the C is after the D so 100 has to be added to 500

Tiffany has learned enjoyed learning about Roman Numerals and she hopes you have too.