Declension table of ?phaṇitavya

Neuter	Singular	Dual	Plural
Nominative	phaṇitavyam	phaṇitavye	phaṇitavyāni
Vocative	phaṇitavya	phaṇitavye	phaṇitavyāni
Accusative	phaṇitavyam	phaṇitavye	phaṇitavyāni
Instrumental	phaṇitavyena	phaṇitavyābhyām	phaṇitavyaiḥ
Dative	phaṇitavyāya	phaṇitavyābhyām	phaṇitavyebhyaḥ
Ablative	phaṇitavyāt	phaṇitavyābhyām	phaṇitavyebhyaḥ
Genitive	phaṇitavyasya	phaṇitavyayoḥ	phaṇitavyānām
Locative	phaṇitavye	phaṇitavyayoḥ	phaṇitavyeṣu

Compound phaṇitavya -

Adverb -phaṇitavyam -phaṇitavyāt