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Q: What fraction of numbers from 1 to 15 are prime numbers?

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

It is 15/50 = 3/10.

3/10 are prime.

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

There are 15 prime numbers between 1 and 49

Prime numbers from 1 to 15 are 2, 3, 5, 7, 11 and 13.

No, they are composite numbers. The factors of 15 are 1, 3, 5, and 15. The factors of 33 are 1, 3, 11, and 33. Prime numbers have two factors: 1 and the number itself, so 15 and 33 cannot be prime.

There are 23 numbers in the range and so the fraction is 9/23.

There are 15 prime numbers in between 1 and 52. 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47

15 of them.

11+3+1=15 but 1 is not a prime number. 3 + 5 + 7 = 15

The prime factors of 15 are 3 and 5 because 3 and 5 are prime numbers that divide evenly into 15. 1 is a factor of 15, but it is not a prime number.

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