Mathematics
Grade-4-
Easy

Question

Select the prime number.

  1. 18    
  2. 21    
  3. 23    
  4. 24    

Hint:

Verifying the given numbers are prime or not.
Prime number :  prime number  is  a number which is only divisible by 1 and itself.

The correct answer is: 23


    Step 1:
    18 has factors 1, 2, 3, 6, 9 and 18. It is composite.
    21 has factors 1, 3, 7, and 21. It is composite.
    24 has factors 1, 2, 3, 4, 6, 8, 12 and 24. It is composite.
    Step 2:
    Only 23 among the given numbers is a prime number as it is only divisible by 1 and itself.

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