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8th Class Mathematics Exponents and Power Question Bank Exponents and Powers

  • question_answer
    When \[5\times {{10}^{-3}}-2000\times {{10}^{-6}}\] is expressed in standard form, we will get

    A)  \[3\times {{10}^{-2}}\]     

    B)         \[3\times {{10}^{-3}}\]      

    C)  \[3\times {{10}^{3}}\]        

    D)         \[3\times {{10}^{2}}\]        

    Correct Answer: B

    Solution :

    We have, \[5\times {{10}^{-3}}-2000\times {{10}^{-6}}\] \[=5\times {{10}^{-3}}-2\times {{10}^{3}}\times {{10}^{-6}}\] \[=5\times {{10}^{-3}}-2\times {{10}^{3-6}}=5\times {{10}^{-3}}-2\times {{10}^{-3}}\] \[=(5-2)\times {{10}^{-3}}=3\times {{10}^{-3}}\]


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