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A decimal number is one way of representing numbers where each place for a digit has a place value that is ten times that of the place to its right. Most all the numbers that you familiar with (judging from your question) will be decimal numbers. A decimal number need not be a [decimal] fraction.

Q: What is a decimal number?

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A decimal number is not an integer. An integer is a number that is not a fraction, and decimal numbers are decimal fractions.

1.30 is a decimal number

a negative decimal number, a rational number, a nice number

It is a terminating decimal.

You can't change a whole number to a decimal. A decimal and a whole number are both numbers. A decimal is just a number lower than a whole number, or a number in between two whole numbers.

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It is a number with a decimal point. It is not necessarily a decimal number because 24 (no decimal pont) is a decimal number.It is a number with a decimal point. It is not necessarily a decimal number because 24 (no decimal pont) is a decimal number.It is a number with a decimal point. It is not necessarily a decimal number because 24 (no decimal pont) is a decimal number.It is a number with a decimal point. It is not necessarily a decimal number because 24 (no decimal pont) is a decimal number.

No. A whole number is a number with no fractional (decimal) part. Therefore a decimal number can not be a whole number. Another view: 35.0 is a whole number AND a decimal. The fact that a number is a decimal does not automatically require it to have a fractional part. Even 35 is a decimal number (without a decimal point).

A decimal number is not an integer. An integer is a number that is not a fraction, and decimal numbers are decimal fractions.

27.9 IS a decimal number. You can tell it is a decimal number because it has a decimal point (.).

1.30 is a decimal number

A number with two decimal points cannot be a decimal number.

7.5 is a decimal.

A decimal is a way of representing a number. There is no number after a number.A decimal is NOT a decimal point.

7.15 IS a decimal number.

9.6 is a decimal number because it has a decimal point inside

a negative decimal number, a rational number, a nice number

It depends. A terminating decimal is a rational number. A decimal which, after a finite number of places, becomes a repeating (or recurrent) decimal is also a rational number. A decimal that is not terminating, nor [eventually] settles into a recurring pattern is not a rational number. Note that the decimal need not become recurring immediately.