Q: Is 2.7 rational number

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Yes, 27 is a real number. Real numbers include all rational and irrational numbers, and 27 is a rational number because it can be expressed as a fraction, 27/1.

No. 27 is a whole number, and all whole numbers are rational.

No.

If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have done that.

Yes.

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No, it is rational.

Yes, 27 is a real number. Real numbers include all rational and irrational numbers, and 27 is a rational number because it can be expressed as a fraction, 27/1.

No. 27 is a whole number, and all whole numbers are rational.

No

No.

If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have done that.

30

Yes.

If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have accomplished that.

There are infinitely many rational numbers between 2 and 27.

The square root of 729 is 27.Yes, it is a rational number because 27 can be written as simple fraction, 27/1.

5.4 = 5 2/5 = 27/5 so it is a rational number.