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Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced.
After all natural numbers comes the first infinite ordinal, ω, and after that come ω+1, ω+2, ω+3, and so on. (Exactly what addition means will be defined later on: just consider them as names.) After all of these come ω·2 (which is ω+ω), ω·2+1, ω·2+2, and so on, then ω·3, and then later on ω·4.
The ordinal numbers are difficult to reconstruct due to their significant variation in the daughter languages. The following reconstructions are tentative: [ 20 ] "first" is formed with * pr̥h₃- (related to some adverbs meaning "forth, forward, front" and to the particle * prō "forth", thus originally meaning "foremost" or similar) plus ...
Alternatively, and for greater numbers, one may say for 1 ⁄ 2 "one over two", for 5 ⁄ 8 "five over eight", and so on. This "over" form is also widely used in mathematics. Fractions together with an integer are read as follows: 1 + 1 ⁄ 2 is "one and a half" 6 + 1 ⁄ 4 is "six and a quarter" 7 + 5 ⁄ 8 is "seven and five eighths"
Exception to this rule are the ordinal numerals first, second and third. If the basic word ends on the letter t and we add the suffixes for ordinal numerals, then a double t is generally produced. For the ordinal numerals seventh and eighth , we reduce some of the letters of the basic number, for example: osum > osmi (eighth), sedum > sedmi ...
Decimal: The standard Hindu–Arabic numeral system using base ten. Binary: The base-two numeral system used by computers, with digits 0 and 1. Ternary: The base-three numeral system with 0, 1, and 2 as digits. Quaternary: The base-four numeral system with 0, 1, 2, and 3 as digits.
Add the third page, and it is 23:7 in favour of this article. Four pages, 30:10. Five pages has the total at 39:11 - though that extra result refers to the set theory concept specifically as "transfinite ordinal numbers". The ratio therefore falls somewhere between 3:1 and 4:1 in favour of the sense described on this page.
The numbers from 5 onwards do not decline for gender. They also behave somewhat differently when modifying a noun. When placed in the nominative or accusative case, the following noun is put in the genitive plural case, while the numeral remains in the nominative/accusative. In the other cases, the numeral and noun are both in the same case.