I like the second option better. You could also make it part of the sentence... put the words "make a drawing to show" on the same line as the 4 in the division problem (blank lines would, of course be required before and after this part of the sentence). You could, I think continue on the same like with at least part of the next sentence. In essence, you put the spatial thing right within a line of braille.
Sorry for the delay in answering - I was asking others' opinions.