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6th Class Mathematics Playing with Numbers Question Bank Playing with Numbers

  • question_answer
    The table given lists the number of factors for some numbers.
    Number Number of factors
    21 4
    23 2
    25 3
    27 4
    29 2
    What is the number of prime numbers between 20 and 30 from the given table?

    A)  0                                            

    B)  2  

    C)  3                            

    D) 4

    Correct Answer: B

    Solution :

     Prime numbers have only two factors. 23 and 29 are the only prime numbers between 20 and 30.


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