1–2: gender agreement.
3–10: reverse gender with plural genitive counted noun.
11–12: both parts match; 13–19: unit reverses, tens part matches.
20–99: singular accusative counted noun; tens gender-neutral.
100/1000: singular genitive.
Next: Masculine and feminine nouns.
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Key Rules and Next Section
Number Nouns: Rules from One to One Thousand
1–2: gender agreement.
3–10: reverse gender with plural genitive counted noun.
11–12: both parts match; 13–19: unit reverses, tens part matches.
20–99: singular accusative counted noun; tens gender-neutral.
100/1000: singular genitive.
Next: Masculine and feminine nouns.