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In general, because that some variety of hours, add to some portion of one hour, you"d usage the number, plus the fraction, add to "hours", plural. "Four and also a fifty percent hours.", "Three and three-quarters hours," etc.

You are watching: How many minutes is 1.5 hours

However, for the specific case that 1.5 hours, the normal expression is "an hour and also a half". This usage is so usual that "One and also a half hours" in reality sounds strange.


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One and a fifty percent hours

English is a little strange, if I"m talking around exactly one hour, then i say hour and also not hours. For every various other number, I usage plural. This uses to every noun in the English language that has actually a plural tense:

I have one dollarI have actually zero dollarsI have 1.1 dollarsI have -1 dollars
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I love hearing exactly how English-as-a-second-language persons construct phrases like this! It"s so fun. I can fully understand what they room trying to say, but marvel at just how they build the idea in a means that renders sense to them, yet would be unexplained for a aboriginal English speaker.

Here room some ways indigenous English speakers would explain time:

Very common:

"an hour and a half"

"one and a half hours"

"an hour and thirty minutes"

common:

"ninety minutes"

somewhat much less common:

"one hour and also thirty minutes"

uncommon:

"one hour, thirty minutes"

not used:

"one hour, and also one half hour"

"the sum of one hour and half of one hour"

"one hour, add to an additional fifty percent hour"

"two hours minus one half hour"

"seventy-five percent of two hours"

Basically, if that sounds favor a math equation, it"s more than likely not used!


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Adam
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You can always get the end of this conundrum by writing:

An hour and a half

or:

90 minutes


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Other answers discuss writing the amount as words. When writing things as numerals, however, i would indicate that the decimal fraction .5 as being a perfectly great way of indicating "half". For partial-hour quantities other than 30 minutes, I would certainly avoid other decimal fractions unless times are being measure in six-minute or 36-second intervals, however .5 is so idiomatic together "one half" that i would think about "1.5 hours" to be more readable than "1 hour and 30 minutes" or "1 1/2 hours", or even "1½ hours".


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My interpretation of the controversy would it is in "two and a half hours" VS "two and also one half hours". The latter was teach in great school. Toss the portion in as you wish.


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