Denominators.
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If one of the numbers is prime and doesn't go into the other number Or the numbers have no common factors.
Any fraction can go into any other fraction. The concept of "going into" for a limited set of numbers is useful only for integers.
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first go the distnace of the whole number. then simply go the distance of the fraction.
it can't be expressed as a fraction. the numbers after the decimal go on and on without end. No fraction can be divided to equal pi, therefore, it's irrational.