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8th Class Mathematics Rational Numbers Question Bank Rational Numbers

  • question_answer
    What is the average of the two middle rational numbers when \[\frac{4}{-9},\frac{-6}{9},\frac{5}{9},\frac{-7}{9},\frac{8}{9}\] and \[\frac{1}{9}\] are arranged in ascending order?

    A)  \[\frac{1}{8}\]                                                  

    B)                         \[\frac{2}{7}\]                  

    C)                         \[\frac{-3}{7}\]                                

    D)                         \[\frac{-1}{6}\]                

    Correct Answer: D

    Solution :

    Arranging the given rational numbers in ascending order, we  get \[\frac{-7}{9},\,\frac{-6}{9},\,\frac{-4}{9},\,\frac{1}{9},\frac{5}{9},\frac{8}{9}\]. The two middle rational numbers  \[\frac{-4}{9}\]and \[\frac{1}{9}\] Their average is \[\frac{\frac{-4}{9}+\frac{1}{9}}{2}=\frac{-3}{9}\times \frac{1}{2}=\frac{-1}{6}\].


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