عِشْرُونَ — ثَلَاثُونَ — أَرْبَعُونَ — خَمْسُونَ
سِتُّونَ — سَبْعُونَ — ثَمَانُونَ — تِسْعُونَ
These are the eight decade words: 20–90.
They are called ʿuqūd and do not change form according to gender of the counted noun.
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All Eight Decades
Number Nouns: Rules from One to One Thousand
عِشْرُونَ — ثَلَاثُونَ — أَرْبَعُونَ — خَمْسُونَ
سِتُّونَ — سَبْعُونَ — ثَمَانُونَ — تِسْعُونَ
These are the eight decade words: 20–90.
They are called ʿuqūd and do not change form according to gender of the counted noun.