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7th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    DIRECTIONS: Passage ? 1 Read the passage(s) given below and answer the questions that follow. Let K represents any terminating decimal or a number from 1 to 9.999 _ _ _ (or\[1\le K<10\]). Then we can express very large and very small numbers in special form such as \[K\times {{10}^{n}},\] where n is any integer. This form of writing numbers is known as scientific notation. This form of numbers is also called the standard form. Scientific notation of .0000072 is

    A)  \[7.2\times {{10}^{-7}}\]               

    B)  \[7.2\times {{10}^{7}}\]

    C)  \[7.2\times {{10}^{-6}}\]               

    D)  \[72\times {{10}^{-6}}\]

    Correct Answer: C

    Solution :

     \[0.0000072=\frac{72}{10000000}=\frac{72}{10\times {{10}^{6}}}\]        \[=\frac{72}{10}\times {{10}^{-6}}=7.2\times {{10}^{-6}}\]


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