Integers or whole numbers
The purpose is to separate whole numbers from fractional parts of whole numbers.
Decimal point
When the fractional parts, if any, of the two decimal numbers sum to 1.
When the fractional parts of the two decimals (the bits to the right of the decimal point) are equivalent.
It is a decimal fraction. Not just a decimal, since 2,000,000 for example, is a decimal number.It is a decimal fraction. A decimal number need not have any digits in fractional places.
The purpose is to separate whole numbers from fractional parts of whole numbers.
Because 15 is a whole integer with no fractional parts to it, we write 15.0 for it to be a decimal.
They are the decimal fractional part.
The fractional portion is 0.261
From left to right,the signum (or sign),a string of integers representing the integer part (if any),the decimal indicator: nowadays a comma or a full stop (if there is a fractional part - see next),a string of integers representing the fractional part (if any),an ellipsis to indicate that the fractional part continues - either repeating endlessly or not.
34.5 is a decimal 34 1/2 is fractional
64.5 percent is equal to 0.645 in decimal form or 645 parts per thousand in fractional form.
Integers have no fractional parts, so their sum will be zero.
fractional distillation
A decimal number is like a mixed fraction: it has an integer part and a fractional part. If the fractional part is a repeating fraction then the whole number is represented by a repeating decimal.
Decimal point
They comprise the fractional part of a decimal number.