There is no such number because they are infinitely dense. Between any two numbers, there are infinitely many numbers. And between any two of them there are infinitely many.
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An infinite amount of decimal numbers come before 40 but as an integer and whole number it is 39
If the number is before the decimal, it is a whole number. The numbers after the decimal represent fractions of whole numbers. For example if you had to work 8.5 hours, you would work 8 whole hours plus one half hour.
13 3/10 13 is the whole number since it comes before the decimal point. 3 is in the tenths place (the one after the decimal point) so it translates to 3/10.
The difference is that all whole numbers are decimal numbers, but not all decimal numbers are whole numbers. For example a whole number such as 1 is a decimal number but a decimal number such as 1.5 is not a whole number.
It means that when the number is divided into nine it comes out as a whole number, or a number that is not a decimal.