2/5 of the numbers from 1 to 20 are prime numbers
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Yes. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
2/5 are prime, 8/15 are composite (and 1/15 is neither).
Pi is not prime nor composite, instead, it is what is called irrational (It can't be written as a fraction or whole number.) Because only whole numbers can be prime, pi is not prime.
it can't be reduced.
Well, honey, if the numerator of a fraction is a prime number, and the denominator is not a factor of that prime number, then the fraction cannot be simplified any further. Prime numbers are divas that don't like to be divided by anything other than 1 and themselves. So, sit back, relax, and embrace that simplified fraction like the fabulous mathematical masterpiece it is.