इक्कीस (ikkīs) - twenty-one

बाईस (bāīs) - twenty-two

तेईस (teīs) - twenty-three

चौबीस (caubīs) - twenty-four

पच्चीस (paccīs) - twenty-five

छब्बीस (chabbīs) - twenty-six

सत्ताईस (sattāīs) - twenty-seven

अट्ठाईस (aṭṭhāīs) - twenty-eight

उनतीस (untīs) - twenty-nine

तीस (tīs) - thirty

इकत्तीस (ikattīs) - thirty-one

How did I develop this? (1) I used Wikibooks' Hindi:Numbers as a guide; (2) I checked words with my copy of The Oxford Hindi-English Dictionary.