If you mean the numbers to the right of the decimal point, they comprise the fractional part of the number.
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There can be no number that has more than one decimal point.
to change a decimal into a percentage you must take the first two numbers behind the decimal and that is your percentage. If there is only one number like 0.1 add a zero behind that number, and that's your percentage. If there is a number in front of the decimal like 1.9 than the percentage will be in the hundreds. Just add a zero behind the nine, and your percentage is 190%.
Irrational number or repeating decimal
Decimal are not. But negative numbers can be odd or even.
The decimal that never stops is called recurring decimal. For example - 1/3 = 0.3333... and goes on. Such decimals are written with a dot or bar on top of the numbers which are repeating.