-10 is the ratio of -10 to 1. That's rational.
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Rational.
It can be a rational number or an irrational number. For example, sqrt(2)*sqrt(50) = 10 is rational. sqrt(2)*sqrt(51) = sqrt(102) is irrational.
It is a rational number which when expressed as a fraction is 1/10
Irrational.
The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.