Page:The practice of typography; correct composition; a treatise on spelling, abbreviations, the compounding and division of words, the proper use of figures and nummerals by De Vinne, Theodore Low, 1828-1914.djvu/102

 the use of roman numerals for an orderly rendering of dates in title-pages and chapter headings. The numerals in most use are made from combinations of the seven capitals, I, V, X, L, C, D, M:

1 I| 12=XII 30=XXX 500=D 2 II 13 XIII 40 XL 600 DC 3 III 14 XIV 50 L 700 DCC 4 IV 15 XV 60 LX 800 DCCC 5 V 16 XVI 70 LXX 900 CM 6 VI 17 XVII 80 LXXX 1000 M 7 VII 18 XVIII 90 XC 2000 MM 8 VIII 19 XIX 100 C 3000 MMM 9 IX 20 XX 200 CC 4000 MV 10 X 21 XXI 300 CCC 5000 $\overline{V}$ or ∞ 11 XI 22 XXII 400 CD 6000 $\overline{V}$M

When letters that represent numbers of low value follow a letter of high value, the added letters give addition to this high value: XIII stands for 13. When a letter of low value precedes a letter of high value, this preceding letter calls for its subtraction from the following letter of higher value: MCM=1900. For some amounts exceeding 2000 the characters ∞, ╳, $\overline{X}$, $\overline{V}$, and the C inverted as Ↄ, have to be rudely made by the printer, for these characters are not provided in fonts of book type.