It simply means 45. A decimal number is simply a way of representing a number in such a way that the place value of a one is ten times that of a one in the place to its right. If it does not contain a fractional part then the decimal representation does not require a decimal point.
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If you mean: 7 and 45/100 then it is 7.45 as a decimal
45% = 0.45 in decimal
3 as a decimal is 3.0 16/45 as a decimal is 0.3555... (repeating)
.45
.45