13 is an integer. All integers are rational.
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Rational. It's the ratio of 13 to 10.
Any number you can write down exactly is rational.
13 is rational
Rational.
You can divide 65 by rationals and irrationals: Divided by a rational: 65 ÷ 13/2 = 10 Divided by an irrational: 65 ÷ √13 = 5√13
13 is the ratio of 13 to 1 ... nice and rational.
13 is the ratio of 13 to 1, so it's rational.