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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 260 · 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 97 + 102 + 601? (a) 800 (b) 700 (c) 1000 (d) 900
  2. 2.Which is closest to 603 × 69? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  3. 3.Round 34297 to the nearest ten.
  4. 4.Round 35.36 to one decimal place. =
  5. 5.Which is closest to 502 + 96 + 302? (a) 800 (b) 1000 (c) 900 (d) 1100
  6. 6.Which is closest to 993 ÷ 49? (a) 10 (b) 40 (c) 20 (d) 200
  7. 7.Which is closest to 501 × 52? (Round each number first.) (a) 250000 (b) 50000 (c) 25000 (d) 2500
  8. 8.Which is closest to 601 + 400 + 698? (a) 1600 (b) 1700 (c) 1900 (d) 1800
  9. 9.Which is closest to 596 × 89? (Round each number first.) (a) 540000 (b) 54000 (c) 5400 (d) 108000
  10. 10.Round 35.58 to one decimal place. =
  11. 11.Round 42.37 to one decimal place. =
  12. 12.Which is closest to 800 × 29? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  13. 13.Which is closest to 104 + 202 + 699? (a) 900 (b) 1200 (c) 1100 (d) 1000
  14. 14.Round 26038 to the nearest ten.
  15. 15.Which is closest to 898 + 299 + 601? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  16. 16.Round 29.79 to one decimal place. =
  17. 17.Which is closest to 801 + 597 + 597? (a) 1900 (b) 2100 (c) 2000 (d) 2200
  18. 18.Which is closest to 902 + 901 + 399? (a) 2200 (b) 2400 (c) 2300 (d) 2100
  19. 19.Which is closest to 3600 ÷ 39? (a) 45 (b) 900 (c) 180 (d) 90
  20. 20.Which is closest to 102 + 501 + 297? (a) 900 (b) 1000 (c) 1100 (d) 800
  21. 21.Which is closest to 702 + 103 + 195? (a) 1100 (b) 1200 (c) 1000 (d) 900
  22. 22.Which is closest to 500 + 397 + 605? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  23. 23.Round 34267 to the nearest hundred.
  24. 24.Which is closest to 497 + 597 + 295? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  25. 25.Which is closest to 799 ÷ 41? (a) 10 (b) 40 (c) 20 (d) 200
  26. 26.Round 39.38 to one decimal place. =
  27. 27.Which is closest to 395 + 405 + 97? (a) 900 (b) 800 (c) 1100 (d) 1000
  28. 28.Which is closest to 898 ÷ 29? (a) 30 (b) 60 (c) 15 (d) 300
  29. 29.Round 84.67 to one decimal place. =
  30. 30.Round 86.27 to one decimal place. =
  31. 31.Which is closest to 305 + 605 + 396? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  32. 32.Which is closest to 3492 ÷ 49? (a) 700 (b) 140 (c) 70 (d) 35
  33. 33.Which is closest to 295 + 899 + 296? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  34. 34.Round 29.26 to one decimal place. =
  35. 35.Which is closest to 296 × 89? (Round each number first.) (a) 27000 (b) 54000 (c) 2700 (d) 270000
  36. 36.Round 98840 to the nearest hundred.
  37. 37.Round 29.57 to one decimal place. =
  38. 38.Which is closest to 2394 ÷ 29? (a) 160 (b) 800 (c) 80 (d) 40
  39. 39.Which is closest to 795 + 303 + 98? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  40. 40.Round 63386 to the nearest thousand.

Answer key

  1. 800
  2. 42000
  3. 34300
  4. 35.4
  5. 900
  6. 20
  7. 25000
  8. 1700
  9. 54000
  10. 35.6
  11. 42.4
  12. 24000
  13. 1000
  14. 26040
  15. 1800
  16. 29.8
  17. 2000
  18. 2200
  19. 90
  20. 900
  21. 1000
  22. 1500
  23. 34300
  24. 1400
  25. 20
  26. 39.4
  27. 900
  28. 30
  29. 84.7
  30. 86.3
  31. 1300
  32. 70
  33. 1500
  34. 29.3
  35. 27000
  36. 98800
  37. 29.6
  38. 80
  39. 1200
  40. 63000

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