Declension table of ?sārdhasaptan

Neuter	Singular	Dual	Plural
Nominative	sārdhasapta	sārdhasaptnī sārdhasaptanī	sārdhasaptāni
Vocative	sārdhasaptan sārdhasapta	sārdhasaptnī sārdhasaptanī	sārdhasaptāni
Accusative	sārdhasapta	sārdhasaptnī sārdhasaptanī	sārdhasaptāni
Instrumental	sārdhasaptnā	sārdhasaptabhyām	sārdhasaptabhiḥ
Dative	sārdhasaptne	sārdhasaptabhyām	sārdhasaptabhyaḥ
Ablative	sārdhasaptnaḥ	sārdhasaptabhyām	sārdhasaptabhyaḥ
Genitive	sārdhasaptnaḥ	sārdhasaptnoḥ	sārdhasaptnām
Locative	sārdhasaptni sārdhasaptani	sārdhasaptnoḥ	sārdhasaptasu

Compound sārdhasapta -

Adverb -sārdhasapta -sārdhasaptam