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8th Class Mathematics Rational Numbers Question Bank Numbers

  • question_answer
    By what number should we multiply \[\sqrt{2},\sqrt{3},\sqrt{5},\sqrt{6},\sqrt{7},\sqrt{8},\sqrt{11}\] so that the product may be equal to 64?                                 

    A)  \[0.\overline{3}=3/9\]                       

    B)  \[1/3\]                 

    C)  \[0.\overline{387}=387/999\]                       

    D) None of these          

    Correct Answer: B

    Solution :

     \[\frac{a}{b}+\frac{c}{d}=\frac{ad+bc}{bd}\] \[ad+bc,bd\in I,bd\ne 0.\] \[\frac{a}{b}-\frac{c}{d}=\frac{ad-bc}{bd}\]  


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