7th Class Mathematics Rational Numbers Question Bank Rational Numbers

  • question_answer 10) Which of the following sum is in the simplest form?

    A)  \[\frac{4}{9}+\frac{-5}{9}\]                       

    B)  \[\frac{-2}{5}+\frac{13}{20}\]       

    C)         \[\frac{-5}{12}+\frac{11}{-12}\]    

    D)         \[\frac{-7}{8}+\frac{1}{12}+\frac{2}{3}\]

    Correct Answer: A

    Solution :

    (a) \[\frac{4}{9}+\frac{-5}{9}=\frac{4-5}{9}=\frac{-1}{9}\] (b) \[\frac{-2}{5}+\frac{13}{20}=\frac{-8+13}{20}=\frac{5}{20}\] (c) \[\frac{-5}{12}+\frac{11}{-12}=\frac{-5}{12}-\frac{11}{12}=\frac{-5-11}{12}=\frac{-16}{12}\] (d) \[\frac{-7}{8}+\frac{1}{12}+\frac{2}{3}=\frac{-21+2+16}{24}=\frac{-3}{24}\] \[\therefore \] Option (a) is in simplest form,

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