Yes.
Any number that can be expressed as a fraction or a ratio is a rational number. Seven is a rational number because it can be expressed as 7/1.
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It is a rational number. It can be written as a fraction.
It is a rational number, as it can be written as a fraction.
Yes, the sum is always rational.
10.01 is a rational number
Since it can be written as a fraction (9.0 = 90/10), then it 9.0 is a rational number.