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. So the decimal for 180 is 180 – as in the question.
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180 000 000
.018x104=180
160 is a decimal. You can write 160.0 if you want to.
180 = one hundred eighty.
you can write one thousandth as a decimal as 0.010.001