1. Half past ten: Is it also correct to say "(Ka) hapalua i hala ka hola ʻumi"? 2. Quarter past ten: Is it also correct to say "(Ka) hapahā hola ʻumi"? I ask because DL only seems to use i hala/past with the quarter hour.

With this one there is no "ka" at the beginning. When there is a picture of a clock showing 10:15 it forces me to put a "ka" at the beginning