17⁄20 = 0.85
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1720 as a decimal is 1720.0 and as a percent is 172000%
0.45 = 45/100. The greatest common factor of 45 and 100 is 5 and dividing both by 5 gives 9/20.A decimal number is a way of representing a number in such a way that the place value of any digit is ten times that of the digit 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 1720 is 1720 – exactly as in the question.
0.4 as a fraction and decimal
A decimal number is one in which the place value of each digit is ten times the place value of the digit to its right. (... , thousands, hundreds, tens, units, tenths, hundredths, ... ) A decimal point is used to separate the units from the tenths. If a number in decimal form has non-zero digits after the decimal point then it is a decimal fraction. [There is one esoteric exception: if the decimal point is followed by an infinite string of 9s, then it is not a decimal fraction.] Thus 37.6 is a decimal fraction 0.6 is a decimal fraction 0.00000063 is a decimal fraction 37 is not a decimal fraction. 37.0 is not a decimal fraction. 37.999... recurring is no a decimal fraction [it is in fact = 38].
It is called a decimal fraction.