Declining large numbers

Reading historical years and exact populations aloud in formal Arabic is a pinnacle of grammatical mastery. It requires chaining together rules for case endings, reverse gender agreement, and compound structures.

Historical Years: CE and AH

When reciting a year, you generally use the preposition في (in) followed by either the masculine عام or the feminine سنة. Because of the preposition, the entire chain of numbers that follows must drop into the genitive case (مجرور).

  • Thousands and Hundreds: Take a kasra (e.g., ألفِ, مئةِ).
  • Tens (20-90): Use the genitive/accusative suffix ـين.
  • Units (3-9): Take a kasra and must apply reverse gender agreement with the word for "year".

Because عام is masculine, the unit digit in a compound year must take the feminine marker (ة).

There is a strict exception for compound numbers from 11 to 19. These numbers are indeclinable—both parts are permanently locked with a fatha ending (ـَ), even when they sit in a genitive position like reading a year.

When using the Islamic calendar, years are cited using the feminine noun سنة. Because سنة is feminine, reverse agreement dictates that the unit digits (3-9) must drop the feminine marker and appear in their masculine form.

Large Populations and Budgets

When citing statistics, large numbers frequently act as the direct object of a verb like بلغ (to reach), forcing the number chain into the accusative case (منصوب). The units take a fatha (ـَ) or fathatayn (ـً), and the tens use the ـين suffix.

However, if the large number is preceded by a preposition, such as لـ (for/to), the entire sequence shifts back into the genitive case.

When compound numbers include the digit 2 (such as 12), the units behave like a dual noun. In the accusative or genitive case, 12 becomes اثني عشر (for masculine nouns like ألف).

The same accusative rules apply when stating large financial figures acting as direct objects. The hundreds (تِسْعَمِئَةٍ: the case goes on تسع, and مئة stays genitive), units (أربعةً), and tens (خمسينَ) must all agree in case.

Seeing the endings

This course writes Arabic the way books and newspapers print it, without the short-vowel marks, so the ending this lesson is about is usually something you hear in the audio but cannot see in the drills. Here are some of them with every vowel written out:

as writtenfully vocalizedcase of the number
توفيت العالمة العظيمة في سنة ألف وثلاثمئة وتسع وتسعين الهجرية.تُوُفِّيَتِ العَالِمَةُ العَظِيمَةُ فِي سَنَةِ أَلْفٍ وَثَلَاثِمِئَةٍ وَتِسْعٍ وَتِسْعِينَ الهِجْرِيَّةِ.genitive (after سنة)
بدأت الحرب العالمية الأولى في عام ألف وتسعمئة وأربعة عشر الميلادي.بَدَأَتِ الحَرْبُ العَالَمِيَّةُ الأُولَى فِي عَامِ أَلْفٍ وَتِسْعِمِئَةٍ وَأَرْبَعَةَ عَشَرَ المِيلَادِيِّ.genitive, but 14 never changes
في تلك الحقبة، لم يبلغ عدد السكان سبعة وستين مليون نسمة.فِي تِلْكَ الحِقْبَةِ، لَمْ يَبْلُغْ عَدَدُ السُّكَّانِ سَبْعَةً وَسِتِّينَ مِلْيُونَ نَسَمَةٍ.accusative (object)

After سنة or عام the year is the second half of an idafa, so every part of it takes a kasra: أَلْفٍ وَثَلَاثِمِئَةٍ وَتِسْعٍ, and the tens use ـين: وَتِسْعِينَ. Fourteen keeps a fatha on both halves, even here: أَرْبَعَةَ عَشَرَ. As the object of يبلغ the units take fathatayn, سَبْعَةً, and the tens again use ـين: وَسِتِّينَ.

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