Q: What fraction represents the number of prime numbers from 1-20?

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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.

Yes. If the numerator and denominator of a fraction are prime, the fraction is in simplest form. The reason is that each number has only two factors, 1 and the number itself. For that reason, it is not possible for the numerator and denominator to have any factors (other than 1) in common.

Related questions

40 out of 103 is a fraction. Prime numbers are whole numbers. A fraction cannot be a prime number, so 40 out of 103 is not a prime number.

Yes, a prime number can be used in a fraction. For example, 7/9, where 7 is the prime number. Or 7/13, where both are prime numbers.

Yes. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

29 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

No - prime numbers are integers - a fraction cannot be a prime number.

2/5 are prime, 8/15 are composite (and 1/15 is neither).

All prime numbers are rational number because they can be expressed as 'top heavy' fractions as for example the prime number 3 as a fraction is 3/1

9 natural numbers. 4/9 are prime. (this ryhmes)

-23 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

If one of the numbers is prime and doesn't go into the other number Or the numbers have no common factors.

3/10 are prime.

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.