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One of the rules of numbers is making attributive nouns out of the words signifying numbers. An attributive noun is proportional to the type of the number. However, there is no specific rule mentioned for this. It is obvious that it is sometimes made by the rhythm fual which is probably formed by the attributive ‘ya” for instance in “thulath”, “ruba’, ‘thulathi”, and “rubai”. The formation of an attributive noun out of numbers is allowed as far as the attributive rules are concerned, for example in “wahidi” derived from “wahid” and ‘arbai” from “arbaat’.
In a compound form of numbers called “mazji” or mingled compound, an attributive noun is made out of the rule related to the attributed noun, for instance in ‘tisi’ derived from “tisat ashar” or “tisat ashari” as it is said “al-shiat al ithna ashariyah.
Attributive rules in making ‘uqud numbers are derived with the help of a joining element, namely attributive ‘ya’ as in “khamsooni” attributed to “khamsoon ‘ and in joined numbers ‘ma toof’ the attributive ‘ya’ element is attached to both parts.