7th Class Mathematics Fractions and Decimals Question Bank Fractions and Decimals

  • question_answer What is the sum of \[\frac{3}{4},\,\,\frac{7}{6}\]and\[1\frac{3}{5}\] ?

    A)  \[3\frac{2}{3}\]                        

    B)  \[\frac{422}{120}\]

    C)  \[3\frac{23}{60}\]                    

    D)  \[\frac{412}{120}\]

    Correct Answer: B

    Solution :

    (b) To find the sum of \[\frac{3}{4}+\frac{7}{6}+1\frac{3}{5},\] find the L.C.M. of the denominators and then add them. L.C.M. of 4, 5 and 6 is 60. Then, \[\frac{3}{4}+\frac{7}{6}+\frac{8}{5}=\frac{45+70+96}{60}=\frac{211}{60}=\frac{211\times 2}{60\times 2}=\frac{422}{120}\]

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