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 0.23 is

    A)  \[2.3\times {{10}^{-1}}\]               

    B)  \[2.3\]

    C)  \[2.3\times 10\]          

    D)  \[\frac{2.3}{10}\]

    Correct Answer: A

    Solution :

     \[0.23=\frac{23}{100}=\frac{23}{10}\times \frac{1}{10}=2.3\times {{10}^{-1}}\]


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