If you are writing words, yes. But it looks better to say 5:30 rather than five-thirty.
You do not need to hyphenate.
No. It is three thirty, but in five minutes time it will be three thirty-five.
Sure, honey, you hyphenate "30 minutes" when it's being used as an adjective before a noun, like "a 30-minute workout." But if it's just hanging out by itself, no need for that hyphen. Keep it sassy, darling!
Six times five is thirty
You don't.
Thirty five Thirty-five
The time 'two-thirty and thirty-five seconds' would be written: 2:30:35.
Thirty-five hundredths
thirty-five-hundredths = 0.35
Thirty-five thousandths
Thirty five.
Five past four