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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 412 · 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.Which is closest to 503 + 596 + 100? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  2. 2.Round 89.58 to one decimal place. =
  3. 3.Which is closest to 802 + 398 + 795? (a) 1900 (b) 2100 (c) 2000 (d) 2200
  4. 4.Which is closest to 803 + 102 + 195? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  5. 5.Round 31874 to the nearest thousand.
  6. 6.Which is closest to 1602 ÷ 41? (a) 20 (b) 40 (c) 80 (d) 400
  7. 7.Round 54.21 to one decimal place. =
  8. 8.Round 57.48 to one decimal place. =
  9. 9.Which is closest to 2694 ÷ 29? (a) 45 (b) 90 (c) 900 (d) 180
  10. 10.Which is closest to 395 + 99 + 898? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  11. 11.Which is closest to 301 + 400 + 296? (a) 1000 (b) 900 (c) 1200 (d) 1100
  12. 12.Which is closest to 3192 ÷ 41? (a) 160 (b) 800 (c) 40 (d) 80
  13. 13.Which is closest to 96 + 599 + 704? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  14. 14.Which is closest to 596 + 198 + 395? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  15. 15.Round 71.67 to one decimal place. =
  16. 16.Which is closest to 898 × 31? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  17. 17.Which is closest to 998 ÷ 49? (a) 200 (b) 40 (c) 10 (d) 20
  18. 18.Round 33.33 to one decimal place. =
  19. 19.Which is closest to 701 × 59? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
  20. 20.Round 29656 to the nearest ten.
  21. 21.Round 62981 to the nearest ten.
  22. 22.Which is closest to 304 + 304 + 700? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  23. 23.Which is closest to 201 × 78? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  24. 24.Which is closest to 1407 ÷ 21? (a) 140 (b) 70 (c) 700 (d) 35
  25. 25.Round 12.63 to one decimal place. =
  26. 26.Round 14549 to the nearest ten.
  27. 27.Round 54.81 to one decimal place. =
  28. 28.Round 48108 to the nearest ten.
  29. 29.Round 33.12 to one decimal place. =
  30. 30.Round 58893 to the nearest thousand.
  31. 31.Which is closest to 605 + 504 + 599? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  32. 32.Which is closest to 298 × 89? (Round each number first.) (a) 2700 (b) 54000 (c) 27000 (d) 270000
  33. 33.Round 17.21 to one decimal place. =
  34. 34.Round 28.68 to one decimal place. =
  35. 35.Which is closest to 4500 ÷ 51? (a) 180 (b) 90 (c) 45 (d) 900
  36. 36.Round 26.78 to one decimal place. =
  37. 37.Which is closest to 1596 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  38. 38.Round 42674 to the nearest thousand.
  39. 39.Which is closest to 804 × 71? (Round each number first.) (a) 5600 (b) 112000 (c) 56000 (d) 560000
  40. 40.Which is closest to 2995 ÷ 49? (a) 30 (b) 600 (c) 60 (d) 120

Answer key

  1. 1200
  2. 89.6
  3. 2000
  4. 1100
  5. 32000
  6. 40
  7. 54.2
  8. 57.5
  9. 90
  10. 1400
  11. 1000
  12. 80
  13. 1400
  14. 1200
  15. 71.7
  16. 27000
  17. 20
  18. 33.3
  19. 42000
  20. 29660
  21. 62980
  22. 1300
  23. 16000
  24. 70
  25. 12.6
  26. 14550
  27. 54.8
  28. 48110
  29. 33.1
  30. 59000
  31. 1700
  32. 27000
  33. 17.2
  34. 28.7
  35. 90
  36. 26.8
  37. 80
  38. 43000
  39. 56000
  40. 60

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