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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 124 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Round 59.42 to one decimal place. =
  2. 2.Which is closest to 397 × 78? (Round each number first.) (a) 64000 (b) 3200 (c) 32000 (d) 320000
  3. 3.Which is closest to 899 × 22? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  4. 4.Which is closest to 598 + 696 + 700? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  5. 5.Which is closest to 496 × 49? (Round each number first.) (a) 250000 (b) 50000 (c) 25000 (d) 2500
  6. 6.Which is closest to 100 + 496 + 400? (a) 900 (b) 1000 (c) 1100 (d) 1200
  7. 7.Which is closest to 1198 ÷ 31? (a) 40 (b) 20 (c) 400 (d) 80
  8. 8.Round 60699 to the nearest ten.
  9. 9.Round 97004 to the nearest ten.
  10. 10.Round 53.56 to one decimal place. =
  11. 11.Which is closest to 801 × 70? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  12. 12.Round 97.54 to one decimal place. =
  13. 13.Which is closest to 102 + 804 + 305? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  14. 14.Which is closest to 400 × 82? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
  15. 15.Round 45.68 to one decimal place. =
  16. 16.Which is closest to 1495 ÷ 31? (a) 50 (b) 500 (c) 100 (d) 25
  17. 17.Round 45033 to the nearest hundred.
  18. 18.Round 86233 to the nearest hundred.
  19. 19.Round 17.92 to one decimal place. =
  20. 20.Which is closest to 599 × 62? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  21. 21.Which is closest to 802 × 70? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  22. 22.Which is closest to 598 × 18? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  23. 23.Which is closest to 897 × 49? (Round each number first.) (a) 90000 (b) 45000 (c) 4500 (d) 450000
  24. 24.Which is closest to 500 × 78? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  25. 25.Round 58498 to the nearest thousand.
  26. 26.Which is closest to 394 ÷ 21? (a) 40 (b) 200 (c) 20 (d) 10
  27. 27.Round 31.67 to one decimal place. =
  28. 28.Which is closest to 603 ÷ 21? (a) 300 (b) 60 (c) 15 (d) 30
  29. 29.Which is closest to 1008 ÷ 51? (a) 10 (b) 200 (c) 20 (d) 40
  30. 30.Round 82.11 to one decimal place. =
  31. 31.Which is closest to 502 + 104 + 501? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  32. 32.Round 56169 to the nearest hundred.
  33. 33.Round 58.32 to one decimal place. =
  34. 34.Which is closest to 503 + 104 + 695? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  35. 35.Which is closest to 300 × 22? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  36. 36.Which is closest to 1998 ÷ 41? (a) 25 (b) 100 (c) 50 (d) 500
  37. 37.Which is closest to 805 + 499 + 97? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  38. 38.Round 46967 to the nearest hundred.
  39. 39.Which is closest to 2008 ÷ 51? (a) 80 (b) 400 (c) 20 (d) 40
  40. 40.Which is closest to 399 × 29? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000

Answer key

  1. 59.4
  2. 32000
  3. 18000
  4. 2000
  5. 25000
  6. 1000
  7. 40
  8. 60700
  9. 97000
  10. 53.6
  11. 56000
  12. 97.5
  13. 1200
  14. 32000
  15. 45.7
  16. 50
  17. 45000
  18. 86200
  19. 17.9
  20. 36000
  21. 56000
  22. 12000
  23. 45000
  24. 40000
  25. 58000
  26. 20
  27. 31.7
  28. 30
  29. 20
  30. 82.1
  31. 1100
  32. 56200
  33. 58.3
  34. 1300
  35. 6000
  36. 50
  37. 1400
  38. 47000
  39. 40
  40. 12000

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