8th Class Mathematics Playing with Numbers Question Bank Playing with Numbers

  • question_answer If  \[\underline{\begin{align}   & \underline{\begin{align}   & \text{  1  A} \\  & \times \text{    A} \\ \end{align}} \\  & \,\,B\text{  6} \\ \end{align}}\], where A and B are single digit numbers, such that B - A = 3, then the values of A and B respectively are _____.

    A)  4, 5                            

    B)  9, 6    

    C)  5, 4                            

    D)  6, 9    

    Correct Answer: D

    Solution :

    We have, \[\underline{\begin{align}   & \underline{\begin{align}   & 1\text{ } \\  & \times \text{ } \\ \end{align}} \\  & \text{ 6} \\ \end{align}}\] and \[\underline{\begin{align}   & \underline{\begin{align}   & 1\text{ } \\  & \times \text{ } \\ \end{align}} \\  & \text{ 6} \\ \end{align}}\] Since, B-A = 3 \[\therefore \] Possible values of A and B are 6 and 9.

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