For masculine counted nouns, these are the first five forms:
11 — أَحَدَ عَشَرَ
12 — اِثْنَا عَشَرَ / اِثْنَيْ عَشَرَ — the exception.
13 — ثَلَاثَةَ عَشَرَ
14 — أَرْبَعَةَ عَشَرَ
15 — خَمْسَةَ عَشَرَ
Do not treat 12 exactly like the other fixed compounds; its special declension is explained next. This full list is a teaching expansion of the source’s 11–19 range.
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Al-Murakkabāt — Compound Numerals, the Twelve Exception and Declining Baalbek
For masculine counted nouns, these are the first five forms:
11 — أَحَدَ عَشَرَ
12 — اِثْنَا عَشَرَ / اِثْنَيْ عَشَرَ — the exception.
13 — ثَلَاثَةَ عَشَرَ
14 — أَرْبَعَةَ عَشَرَ
15 — خَمْسَةَ عَشَرَ
Do not treat 12 exactly like the other fixed compounds; its special declension is explained next. This full list is a teaching expansion of the source’s 11–19 range.