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2/5 of the numbers from 1 to 20 are prime numbers

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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.

Prime numbers up to 12 are: 2, 3, 5, 7 and 11

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.

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