Declension table of ?pṛthamātra

Masculine	Singular	Dual	Plural
Nominative	pṛthamātraḥ	pṛthamātrau	pṛthamātrāḥ
Vocative	pṛthamātra	pṛthamātrau	pṛthamātrāḥ
Accusative	pṛthamātram	pṛthamātrau	pṛthamātrān
Instrumental	pṛthamātreṇa	pṛthamātrābhyām	pṛthamātraiḥ pṛthamātrebhiḥ
Dative	pṛthamātrāya	pṛthamātrābhyām	pṛthamātrebhyaḥ
Ablative	pṛthamātrāt	pṛthamātrābhyām	pṛthamātrebhyaḥ
Genitive	pṛthamātrasya	pṛthamātrayoḥ	pṛthamātrāṇām
Locative	pṛthamātre	pṛthamātrayoḥ	pṛthamātreṣu

Compound pṛthamātra -

Adverb -pṛthamātram -pṛthamātrāt