Declension table of ?samāpayitavya

Neuter	Singular	Dual	Plural
Nominative	samāpayitavyam	samāpayitavye	samāpayitavyāni
Vocative	samāpayitavya	samāpayitavye	samāpayitavyāni
Accusative	samāpayitavyam	samāpayitavye	samāpayitavyāni
Instrumental	samāpayitavyena	samāpayitavyābhyām	samāpayitavyaiḥ
Dative	samāpayitavyāya	samāpayitavyābhyām	samāpayitavyebhyaḥ
Ablative	samāpayitavyāt	samāpayitavyābhyām	samāpayitavyebhyaḥ
Genitive	samāpayitavyasya	samāpayitavyayoḥ	samāpayitavyānām
Locative	samāpayitavye	samāpayitavyayoḥ	samāpayitavyeṣu

Compound samāpayitavya -

Adverb -samāpayitavyam -samāpayitavyāt