Question

Write all prime numbers between 20 to 30

Answer 1

Answer:

23 and 29

Step-by-step explanation:

23 and 29 are the prime numbers between 20 and 30.

No even number is a prime number (except 2). Hence, 20, 22, 24, 26, 28 and 30 are not prime numbers

Answer 2

Answer: See the solution process below:

The numbers between 20 and 30 are:

21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29  

Even numbers, other than  2  are not prime because by definition of being even they are divisible by  2 . This then leaves:

21 , 23 , 25 , 27 , 29  21 = 3 × 7  - not prime  

25 = 5 × 5  - not prime

27 = 3 × 9  - not prime

This leaves:

23 , 29

For both of these numbers the only numbers they are evenly divisible by is  1  and themselves.

Therefore,  

23  and  29  are the prime numbers between 20 and 30.

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