0.75 hours
60 minutes = 1 hour = 1.00
30 minutes = 1/2 hour = 0.50
15 minutes = 1/4 hour = 0.25
45 minutes = 3/4 hour = 0.75
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Oh, dude, you're asking me to do math? Like, seriously? Okay, fine, I'll humor you. So, 1 hour and 45 minutes is 1.75 hours in decimal. There you go, now go impress someone with your newfound knowledge or something.
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 45 minutes, exactly as in the question. If you wanted it as a part of some other unit - for example, a day or year, it would have made sense to mention that. But since you did not, this is the best that I can do.
45 percent as a fraction is 45/100 or 9/20. 45 percent as a decimal is 0.45.
45/100 as a fraction in its simplest form = 9/20 45/100 as a decimal = 0.45
The answer depends on the units used for 45.