There are 2 prime numbers between 20 and 30 that is :
23 and 29
Prime numbers are numbers that are not multiples of any number except for 1 and itself!

Positive: 50 %

Answer #5 | 11/11 2014 18:09

A prime factor is a prime number that is a divisor of a number. For example, the divisors of 12 are: 1, 2, 3, 4, 6 and 12. From those six divisors, 2 and 3 are prime numbers (and they are the only divisors of 12 that are prime numbers). Hence 2 and 3 are the prime factors of 12.
prime factors of 21: 3 and 7
prime factors of 22: 2 and 11
prime factors of 23: 23
prime factors of 24: 2 and 3
prime factors of 25: 5
prime factors of 26: 2 and 13
prime factors of 27: 3
prime factors of 28: 2 and 7
prime factors of 29: 29
Hence the prime factors of all numbers between 20 and 30 are: 2, 3, 5, 7, 11, 13, 23, 29 .
(note that prime numbers 17 and 19 are missing from that list; because they have no multiples inbetween 20 and 30.)

Positive: 50 %

Answer #6 | 12/11 2014 16:28

2,3,5

Positive: 50 %

Answer #7 | 12/11 2014 02:09

A prime factor is a prime number that is a divisor of a number. For example, the divisors of 12 are: 1, 2, 3, 4, 6 and 12. From those six divisors, 2 and 3 are prime numbers (and they are the only divisors of 12 that are prime numbers). Hence 2 and 3 are the prime factors of 12.
prime factors of 21: 3 and 7
prime factors of 22: 2 and 11
prime factors of 23: 23
prime factors of 24: 2 and 3
prime factors of 25: 5
prime factors of 26: 2 and 13
prime factors of 27: 3
prime factors of 28: 2 and 7
prime factors of 29: 29
Hence the prime factors of all numbers between 20 and 30 are: 2, 3, 5, 7, 11, 13, 23, 29 .
(note that prime numbers 17 and 19 are missing from that list; because they have no multiples inbetween 20 and 30.)

Positive: 50 %

Answer #8 | 11/11 2014 17:15

23, 27 and 29.

Positive: 50 %

Answer #9 | 11/11 2014 17:15

There are 2 prime numbers between 20 and 30 that is :
23 and 29
Prime numbers are numbers that are not multiples of any number except for 1 and itself!

Answer #1| 12/11 2014 01:1560 %