Yes, "forty-five" needs a hyphen when used as a compound adjective before a noun or when it stands alone as a number. For example, you would write "forty-five apples" or simply "forty-five." However, when used in a sentence without a noun, such as "I have forty five," the hyphen is not necessary.
Ideally, yes
One forty five A. M. One forty five P. M. zero one forty five thirteen forty five
545,000 is five hundred forty-five thousand 0.545 is five hundred forty-five thousandths 500.045 is five hundred and forty-five thousandths
40.545 in word form is 'Forty point five four five'. NB NOT 'forty point five hundred and forty five'.
Six forty five
Yes, you need a hyphen between "five" and "story" when using it as a compound adjective before a noun, as in "five-story building." The hyphen clarifies that the two words work together to describe the noun. However, if the phrase appears after the noun, such as in "the building is five stories tall," no hyphen is needed.
Ideally, yes
forty-five
Yes, "five-day trip" should have a hyphen. The hyphen is used to create a compound adjective that describes the noun "trip." Without the hyphen, it can lead to confusion about whether "five" and "day" are intended to be read together as a single descriptor.
Yes. If it's going to refer to one number (55), it needs a hyphen, otherwise it looks like you're writing about 50 and 5.
You asked for it! Five hundred forty nonillion five hundred forty octillion five hundred forty septillion five hundred forty quintillion five hundred forty trillion five hundred forty million.
It does not need to have a hyphen! :)
One forty five A. M. One forty five P. M. zero one forty five thirteen forty five
545,000 is five hundred forty-five thousand 0.545 is five hundred forty-five thousandths 500.045 is five hundred and forty-five thousandths
I would write it as five and forty-five thousandths.
five hundred forty five thousand five hundred forty five
The number 45 in English is spelled forty-five. It is never spelled fourty-five.