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. 421 x 0.9 +130 x 101 + 10000 = ?
    1. 33500
    2. 23500
    3. 225000
    4. 24500

  1. View Hint View Answer Discuss in Forum

    ? = 421 x 0.9 +130 x 101 x 10000
    = 378.9 + 13130 +10000

    Correct Option: B

    ? = 421 x 0.9 +130 x 101 x 10000
    = 378.9 + 13130 +10000
    = 23508.9 ≈ 23500


  1. 30.9 x 3000 - 10.1 x 1100 + 8298- 4302 = ?
    1. 80000
    2. 90000
    3. 105000
    4. 85000

  1. View Hint View Answer Discuss in Forum

    ? = 30.9 x 3000 -10.1 x 1100 + 8298 - 4302
    = 92700 - 11110 + 8298 - 4302

    Correct Option: D

    ? = 30.9 x 3000 -10.1 x 1100 + 8298 - 4302
    = 92700 - 11110 + 8298 - 4302
    = 92700 - 11110 + 8298 - 4302
    = 85586 ≈ 85000



  1. 56.001 x ? - 1000.999 = 231
    1. 22
    2. 45
    3. 37
    4. 16

  1. View Hint View Answer Discuss in Forum

    56.001 x ? - 1000.999 = 231
    ⇒ 56 x ? - 1001 = 231

    Correct Option: A

    56.001 x ? - 1000.999 = 231
    ⇒ 56 x ? - 1001 = 231
    ⇒ 56 x ? = 231 +1001 = 1232/56 = 22


  1. 1010 ÷ 36+187 x 20.05 = ?
    1. 3650
    2. 3770
    3. 3825
    4. 3800

  1. View Hint View Answer Discuss in Forum

    b ? = 1010 ÷ 36 + 187 x 20.05
    = 28.0555 + 3749.35

    Correct Option: B

    b ? = 1010 ÷ 36 + 187 x 20.05
    = 28.0555 + 3749.35 = 3777.40 ≈ 3770



  1. 724 ÷ 25 x 31.05 + 101 = ?
    1. 900
    2. 1000
    3. 950
    4. 1050

  1. View Hint View Answer Discuss in Forum

    724 ÷ 25 x 31.05 + 101 = ?
    ⇒ ? = 725 ÷ 25 x 31 + 101

    Correct Option: B

    724 ÷ 25 x 31.05 + 101 = ?
    ⇒ ? = 725 ÷ 25 x 31 + 101
    = 29 x 31+ 101
    = 899 + 101 = 1000