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.
You do not hyphenate 30 minutes, as in "She took thirty minutes to finish her test."You do, however, hyphenate 30-minute as in, "She took the thirty-minute exam."The distinction is that in this latter case 'thirty-minute' is used as a compound adjective (describing the timed exam) whereas in the first example 'thirty' is an adjective describing 'minutes'.An easier way to remember it is that you only hyphenate when the adjectives are acting together for a single purpose (such as modifying a single word together).
Six times five is thirty
You don't.
No, "thirty first" should not have a hyphen. It is written as two separate words when used in a sentence, for example, "The event is on the thirty first of July." However, if it appears as an adjective before a noun, you can hyphenate it as "thirty-first," such as in "the thirty-first day."
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.