Estimation

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  • Q1

    Rounding off of 730 + 998 is

    Marks:1
    Answer:

    1700

    Explanation:

    As 730 lies between 700 & 800 and 730 is less than 750, therefore it is rounded off to 700.

    Similarly 998 lies between 900 & 1000 and 998 is more than 950, therefore it is rounded off to 1000

    So, 700 + 1000
    = 1700

     

     

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  • Q2

    Estimated difference to the nearest hundred of 3257 – 2470 will be

    Marks:1
    Answer:

    800.

    Explanation:
    Look 257 lies between 200 & 300 since 257 is more than 250.
    Therefore Rounded to 300. Similarly 470 between 400 & 500 470 is more than 450, therefore rounded to 500
    = 3300 – 2500
    = 800

     

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  • Q3

    Rough estimate (by rounding off to nearest tens) of 439 + 334 + 4317 will be

    Marks:1
    Answer:

    5090.

    Explanation:
    Rounding to nearest tens.
    439 to 440, 334 to 330, 4317 to 4320
    = 440 + 330 + 4320
    = 5090

     

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  • Q4

    Estimation of 19 x 78 is

    Marks:1
    Answer:

    1600.

    Explanation:
    19 will become 20. 78 will become 80. So, 20 x 80 = 1600.
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  • Q5

    Rounding off to nearest hundreds of 87 + 521 is

    Marks:1
    Answer:

    600.

    Explanation:
    87 after rounding off will become 100 and 521 as 500 .So, 500+100 = 600.
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