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1 November, 02:41

Which one of the following uses estimation to check 267-154=113? a. 300-200=100. b. 113+154=267. c. 300-150=150. d. 270-150=120

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  1. 1 November, 02:49
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    A. 300-200=100

    You round 267 to 300, 154 to 200, and 113 to 100.
  2. 1 November, 03:05
    0
    A, C and D are all using estimation to check the result.

    A is rounding to the nearest multiple of 100.

    267 - - > 300

    154 - - > 200

    C is rounding to the nearest multiple of 50.

    267 - - > 300

    154 - - > 150

    D is rounding to the nearest multiple of 10.

    267 - - > 270

    154 - - > 150

    Those each give you an estimation of the final answer to see if 113 is a reasonable answer.

    Method B is just switching the values around to check the subtraction using addition. That's a valid way to double check the result, but is NOTestimation.

    If you are only expected to give * one * answer, then method D is the best way to check using estimation because it does the least amount of rounding.

    Answer:

    D. 270 - 150 = 120
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