Approximation


Direction: What approximate value should come in place of the question mark(?) in the following question ? (Note that you are not expected to calculate the exact value).

  1. 31% of 1508 + 26% of 2018 = ?









  1. View Hint View Answer Discuss in Forum

    ? = 31% of 1508 + 26% of 2018
    = 1508 x 31 + 20.18 x 26

    Correct Option: C

    ? = 31% of 1508 + 26% of 2018
    = 1508 x 31 + 20.18 x 26
    = 467.48 + 524.68
    ≈ 992.16 = 1000


  1. 85% of 225 + 32.91 x 5.01 = ?









  1. View Hint View Answer Discuss in Forum

    ? = 85% of 225 + 32.91 x 5.01
    ≈ 85% of 225 + 33 x 5
    = (225 x 85)/100 + 165

    Correct Option: C

    ? = 85% of 225 + 32.91 x 5.01
    ≈ 85% of 225 + 33 x 5
    = (225 x 85)/100 + 165
    = 191.25 + 165 = 356.25 = 355



  1. (15.96)2 + 75% of 285 = ?









  1. View Hint View Answer Discuss in Forum

    ? = (15.96)2 + 75 % of 285
    ≈ (16)2 + 214

    Correct Option: D

    ? = (15.96)2 + 75 % of 285
    ≈ (16)2 + 214 = 256 + 214 = 470


  1. 0.0005 x 76 x 103 + ? = 170% of 29.98 ?









  1. View Hint View Answer Discuss in Forum

    0.0005 x 76 x 103 + ? = 170% of 29.98
    ⇒ 0.038 x 1000 + ? = (30 x 170)/100

    Correct Option: A

    0.0005 x 76 x 103 + ? = 170% of 29.98
    ⇒ 0.038 x 1000 + ? = (30 x 170)/100
    ∴ ? = 51- 38 = 13 ≈ 12



  1. 39.8% of 400 + ?% of 350 = 230









  1. View Hint View Answer Discuss in Forum

    39.8% of 400 + ?% of 350 = 230
    ⇒ 159.2 + 350 + x ?/100 = 230

    Correct Option: D

    39.8% of 400 + ?% of 350 = 230
    ⇒ 159.2 + (350 x ?)/100 = 230
    &Arr; ? = (230 - 159.2) x 100/360 = 20.23 = 20