which equation is not a reasonable estimate for 533÷57. how can you know when an estimate is not reasonable?

Question

which equation is not a reasonable estimate for 533÷57. how can you know when an estimate is not reasonable? A. 540÷60=9. B.500÷50=10. C.550÷55=10. D.420÷60=7​

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Madelyn 3 days 2021-10-14T02:38:35+00:00 1 Answer 0

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    2021-10-14T02:40:28+00:00

    Answer:

    D. 420÷60=7​

    Step-by-step explanation:

    Given expression,

    533\div 57

    Since, 533 to nearest ten = 540,

    And, 57 to nearest ten = 60,

    \implies 533\div 57\approx 540\div 60 = 9

    Now, nearest fifty of 533 = 550,

    And, nearest fifth of 57 = 55,

    \implies 533\div 57\approx 550\div 55 = 10

    Now, nearest hundred of 533 = 500,

    Also, 57 is near to 50,

    That is, answer will not much affected by taking 50 in the place of 57,

    Again nearest hundred of 533 = 500,

    \implies 533\div 57\approx 500\div 50 = 10

    When we analyse above explanation,

    we observed that answer is approximately 9 or 10.

    Hence, 420÷60=7​ can not be the reasonable estimation.

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