### Read and Write Roman Numeral LXXXI

Roman numeral symbols are written and read from left to right, from highest to lowest values. If LXXXI is text, it is the number 81.

### Miscellaneous & Conversions For 81

 Written English Eighty-One Roman Numeral 81 LXXXI RGB Colour (# 051 or #000051)

 Decimal / Number 81 Binary 1010001 Ternary 10,000 Hexadecimal (Hex) 0x51 Quaternary 1,101 Quinary 311 Senary (Heximal) 213 Octal 121 Duodecimal (Dozenal) 69

### Mathematics

 Prime Factors: 3 x 3 x 3 x 3 = 81 Factorial: 81! 5.79712602075E+120 Harshad Number: 81 True Triangular Number Of 81 3321 Square Root: √81 9 Cube Root (Root 3): 3√81 4.32674871092 Tesseract Root (Root 4): 4√81 3 Quintal / nth Root. (Root 5) 5√81 2.40822468528 ¾ Root 27 Fibonnaci # 81 37889062373143906 Recipricol 1/ 81 0.0123456790123 Quarter 1/4 20.25 or 20.25/81 Half 1/2 40.50 or 40.50/81 Third 1/3 27 or 27/81

### Roman Numeral Chart. Read & Write 81

Reading and writing roman numerals isn't common knowledge. However, this roman numeral chart should help you read and write numbers in roman numerals from 1 to 1,000,000. Using an overline symbol is times 1,000. ( Example: X means to add 3 zeros to your number. So X which is 5, but written as X with the overline is 5,000.

• When a symbol appears after a larger symbol it is added: Example: VI = V + I = 5 + 1 = 6
• When a symbol appears before a larger symbol it is subtracted: Example: IX = X - I = 10 - 1 = 9
• Do not use the same symbol more than 3 times. But, IIII is sometimes used for 4
 1 I 10 x 500 D 1,001 MI 2 II 20 XX 501 DI 1,002 MII 3 III 30 XXX 530 DXXX 1,030 MXXX 4 IV 40 XL 550 DL 1,550 MDL 5 V 50 L 600 DC 1,555 MDLV 6 VI 60 LX 650 DCL 5,000 V 7 VII 70 LXX 700 DCC 10,000 X 8 VIII 80 LXXX 800 DCCC 50,000 L 9 IX 90 XC 890 DCCCXC 100,000 C 10 X 95 XCV 900 CM 500,000 D 11 XI 99 XCIX 950 CML 1,000,000 M 12 XII... 100 C 1000 M
 39 XXXIX 37 XXXVII

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