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.
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If you are referring to 3 and 45 over 100, the the answer is 3.45 in decimal form.
45/100 as a fraction in its simplest form = 9/20 45/100 as a decimal = 0.45
45% = 0.46
As there are a maximum of 60 minutes in an hour, 55 minutes in decimal form would be 55 divided by 60, which is 0.91666.
It is written like 0.45.