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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 606 · 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 900 + 105 + 898? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  2. 2.Round 60.82 to one decimal place. =
  3. 3.Round 60.43 to one decimal place. =
  4. 4.Which is closest to 898 + 303 + 505? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  5. 5.Which is closest to 2503 ÷ 49? (a) 500 (b) 100 (c) 25 (d) 50
  6. 6.Which is closest to 197 × 41? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  7. 7.Round 53954 to the nearest thousand.
  8. 8.Which is closest to 796 × 52? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  9. 9.Which is closest to 1503 ÷ 51? (a) 30 (b) 15 (c) 300 (d) 60
  10. 10.Round 16.17 to one decimal place. =
  11. 11.Which is closest to 901 × 18? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  12. 12.Which is closest to 696 × 69? (Round each number first.) (a) 98000 (b) 4900 (c) 490000 (d) 49000
  13. 13.Which is closest to 605 + 398 + 298? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  14. 14.Round 41.16 to one decimal place. =
  15. 15.Round 69840 to the nearest hundred.
  16. 16.Which is closest to 897 + 798 + 605? (a) 2300 (b) 2500 (c) 2400 (d) 2200
  17. 17.Which is closest to 701 × 80? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  18. 18.Which is closest to 801 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20
  19. 19.Round 88511 to the nearest hundred.
  20. 20.Which is closest to 1193 ÷ 21? (a) 30 (b) 600 (c) 60 (d) 120
  21. 21.Which is closest to 394 ÷ 21? (a) 40 (b) 200 (c) 20 (d) 10
  22. 22.Which is closest to 400 + 600 + 202? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  23. 23.Which is closest to 1191 ÷ 31? (a) 80 (b) 20 (c) 400 (d) 40
  24. 24.Which is closest to 799 × 42? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  25. 25.Round 87.19 to one decimal place. =
  26. 26.Which is closest to 300 × 92? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  27. 27.Round 34.23 to one decimal place. =
  28. 28.Round 30.63 to one decimal place. =
  29. 29.Which is closest to 605 + 405 + 796? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  30. 30.Which is closest to 1607 ÷ 19? (a) 800 (b) 40 (c) 160 (d) 80
  31. 31.Round 66.67 to one decimal place. =
  32. 32.Which is closest to 600 × 21? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  33. 33.Round 14.34 to one decimal place. =
  34. 34.Which is closest to 898 × 52? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  35. 35.Which is closest to 804 + 504 + 496? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  36. 36.Which is closest to 397 × 41? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  37. 37.Which is closest to 904 + 203 + 304? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  38. 38.Which is closest to 1404 ÷ 19? (a) 70 (b) 140 (c) 700 (d) 35
  39. 39.Which is closest to 602 × 42? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  40. 40.Which is closest to 601 × 92? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000

Answer key

  1. 1900
  2. 60.8
  3. 60.4
  4. 1700
  5. 50
  6. 8000
  7. 54000
  8. 40000
  9. 30
  10. 16.2
  11. 18000
  12. 49000
  13. 1300
  14. 41.2
  15. 69800
  16. 2300
  17. 56000
  18. 40
  19. 88500
  20. 60
  21. 20
  22. 1200
  23. 40
  24. 32000
  25. 87.2
  26. 27000
  27. 34.2
  28. 30.6
  29. 1800
  30. 80
  31. 66.7
  32. 12000
  33. 14.3
  34. 45000
  35. 1800
  36. 16000
  37. 1400
  38. 70
  39. 24000
  40. 54000

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