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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 983 · 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 803 × 80? (Round each number first.) (a) 128000 (b) 6400 (c) 64000 (d) 640000
  2. 2.Round 16.87 to one decimal place. =
  3. 3.Round 75.83 to one decimal place. =
  4. 4.Which is closest to 497 × 49? (Round each number first.) (a) 50000 (b) 2500 (c) 25000 (d) 250000
  5. 5.Which is closest to 803 + 799 + 204? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  6. 6.Which is closest to 298 × 92? (Round each number first.) (a) 270000 (b) 27000 (c) 54000 (d) 2700
  7. 7.Which is closest to 1194 ÷ 29? (a) 400 (b) 80 (c) 20 (d) 40
  8. 8.Which is closest to 1196 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600
  9. 9.Which is closest to 1497 ÷ 51? (a) 60 (b) 300 (c) 15 (d) 30
  10. 10.Which is closest to 802 × 20? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  11. 11.Round 7767 to the nearest ten.
  12. 12.Which is closest to 403 + 505 + 401? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  13. 13.Round 86.21 to one decimal place. =
  14. 14.Round 7802 to the nearest ten.
  15. 15.Which is closest to 502 + 302 + 699? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  16. 16.Round 65.69 to one decimal place. =
  17. 17.Round 16056 to the nearest ten.
  18. 18.Which is closest to 704 × 60? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  19. 19.Which is closest to 95 + 505 + 202? (a) 1000 (b) 800 (c) 700 (d) 900
  20. 20.Round 72.61 to one decimal place. =
  21. 21.Round 22.14 to one decimal place. =
  22. 22.Round 86306 to the nearest ten.
  23. 23.Which is closest to 802 × 91? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  24. 24.Round 70.71 to one decimal place. =
  25. 25.Which is closest to 699 × 59? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  26. 26.Round 41.82 to one decimal place. =
  27. 27.Which is closest to 701 + 295 + 201? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  28. 28.Which is closest to 2395 ÷ 31? (a) 80 (b) 40 (c) 160 (d) 800
  29. 29.Round 35.42 to one decimal place. =
  30. 30.Which is closest to 1492 ÷ 31? (a) 50 (b) 500 (c) 25 (d) 100
  31. 31.Which is closest to 504 + 605 + 798? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  32. 32.Round 52355 to the nearest hundred.
  33. 33.Which is closest to 201 × 72? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  34. 34.Which is closest to 499 + 802 + 99? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  35. 35.Which is closest to 703 + 799 + 496? (a) 2000 (b) 1900 (c) 2200 (d) 2100
  36. 36.Round 37482 to the nearest thousand.
  37. 37.Which is closest to 1807 ÷ 21? (a) 180 (b) 90 (c) 45 (d) 900
  38. 38.Which is closest to 700 + 301 + 401? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  39. 39.Round 16665 to the nearest thousand.
  40. 40.Which is closest to 198 + 298 + 402? (a) 800 (b) 1000 (c) 900 (d) 1100

Answer key

  1. 64000
  2. 16.9
  3. 75.8
  4. 25000
  5. 1800
  6. 27000
  7. 40
  8. 60
  9. 30
  10. 16000
  11. 7770
  12. 1300
  13. 86.2
  14. 7800
  15. 1500
  16. 65.7
  17. 16060
  18. 42000
  19. 800
  20. 72.6
  21. 22.1
  22. 86310
  23. 72000
  24. 70.7
  25. 42000
  26. 41.8
  27. 1200
  28. 80
  29. 35.4
  30. 50
  31. 1900
  32. 52400
  33. 14000
  34. 1400
  35. 2000
  36. 37000
  37. 90
  38. 1400
  39. 17000
  40. 900

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