Three quarters is the simplest form for six eights. For five eights there is no simpler form.
3/8 of 40 = 15
Four duodecillion, three hundred forty-three undecillion, four hundred thirty-four decillion, three hundred forty-three nonillion, four hundred forty-three octillion, four hundred thirty-four septillion, three hundred forty-four sextillion, three hundred forty-three quintillion, four hundred thirty-four quadrillion, three hundred forty-three trillion, four hundred thirty-four billion, three hundred forty-three million, four hundred thirty-four thousand, four hundred thirty-four.
3/8 of 48 is 18.
one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty twenty one twenty two twenty three twenty four twenty six twenty seven twenty eight twenty nine thirty thirty one thirty two thirty three thirty four thirty five thirty six thirty seven thirty eight thirty nine forty forty one forty two forty three forty four forty five forty six forty seven forty eight forty nine fifty
thirty three fortieths
4 and three eights.
2 and thirty-nine fortieths
thirty, thirty-one, thirty-two, thirty-three, thirty-four, thirty-five, thirty-six, thirty-seven, thirty-eight, thirty nine, forty