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    Question

    What approximate value

    will replace the question mark (?) in the following? 39.99 × 40.01 – 31.01 × 30.99 = ?
    A 336 Correct Answer Incorrect Answer
    B 459 Correct Answer Incorrect Answer
    C 549 Correct Answer Incorrect Answer
    D 639 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    39.99 × 40.01 – 31.01 × 30.99 = ? 40 × 40 – 31 × 31 ~ ? ? ~ 1600 – 961 ? ~ 639

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