Declension table of kartṛ

Masculine	Singular	Dual	Plural
Nominative	kartā	kartārau	kartāraḥ
Vocative	kartaḥ	kartārau	kartāraḥ
Accusative	kartāram	kartārau	kartṝn
Instrumental	kartrā	kartṛbhyām	kartṛbhiḥ
Dative	kartre	kartṛbhyām	kartṛbhyaḥ
Ablative	kartuḥ	kartṛbhyām	kartṛbhyaḥ
Genitive	kartuḥ	kartroḥ	kartṝṇām
Locative	kartari	kartroḥ	kartṛṣu

Compound kartṛ -

Adverb -kartṛ