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7th Class Mathematics Rational Numbers Question Bank Rational Numbers

  • question_answer
    Find the simplest form of \[\left( -\frac{1}{2}+\frac{1}{3}+\frac{1}{6} \right)\left( \frac{-2}{5} \right)\times \left( 36\frac{7}{15}-91\frac{8}{19}+1011\frac{231}{611} \right).\]

    A)  0      

    B)  \[-\frac{1}{2}\]

    C)  1                                

    D)  \[\frac{2}{5}\]

    Correct Answer: A

    Solution :

    (a) : First term \[\left( -\frac{1}{2}+\frac{1}{3}+\frac{1}{6} \right)\] \[=\frac{-3+1+2}{6}=0\] Now, zero multiplied by any number is zero. This is called mathematical ingenuity. Otherwise if you evaluate \[\left( 36\frac{7}{15}-91\frac{8}{19}+1011\frac{231}{611} \right)\], it is very tedious.                   


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