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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 129 · 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 295 + 400 + 505? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  2. 2.Which is closest to 698 × 29? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  3. 3.Round 25976 to the nearest hundred.
  4. 4.Which is closest to 897 × 61? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  5. 5.Which is closest to 302 × 58? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  6. 6.Which is closest to 791 ÷ 41? (a) 200 (b) 40 (c) 20 (d) 10
  7. 7.Which is closest to 696 × 39? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  8. 8.Which is closest to 1209 ÷ 19? (a) 600 (b) 60 (c) 120 (d) 30
  9. 9.Which is closest to 3993 ÷ 51? (a) 80 (b) 800 (c) 160 (d) 40
  10. 10.Which is closest to 399 + 705 + 599? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  11. 11.Which is closest to 297 + 799 + 695? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  12. 12.Which is closest to 1007 ÷ 49? (a) 10 (b) 200 (c) 20 (d) 40
  13. 13.Round 85584 to the nearest hundred.
  14. 14.Round 38660 to the nearest thousand.
  15. 15.Which is closest to 1608 ÷ 21? (a) 160 (b) 40 (c) 800 (d) 80
  16. 16.Which is closest to 299 + 105 + 903? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  17. 17.Which is closest to 500 × 89? (Round each number first.) (a) 90000 (b) 450000 (c) 45000 (d) 4500
  18. 18.Which is closest to 397 × 21? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  19. 19.Round 87904 to the nearest thousand.
  20. 20.Round 10.38 to one decimal place. =
  21. 21.Which is closest to 298 × 18? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  22. 22.Round 65599 to the nearest ten.
  23. 23.Which is closest to 797 × 79? (Round each number first.) (a) 64000 (b) 128000 (c) 6400 (d) 640000
  24. 24.Round 22.51 to one decimal place. =
  25. 25.Which is closest to 802 × 40? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
  26. 26.Which is closest to 700 × 18? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  27. 27.Round 70.89 to one decimal place. =
  28. 28.Round 57503 to the nearest ten.
  29. 29.Round 30.27 to one decimal place. =
  30. 30.Which is closest to 203 × 31? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  31. 31.Which is closest to 800 × 78? (Round each number first.) (a) 128000 (b) 6400 (c) 640000 (d) 64000
  32. 32.Which is closest to 1504 ÷ 51? (a) 300 (b) 30 (c) 60 (d) 15
  33. 33.Round 37.79 to one decimal place. =
  34. 34.Which is closest to 1206 ÷ 21? (a) 30 (b) 60 (c) 120 (d) 600
  35. 35.Which is closest to 502 × 71? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  36. 36.Which is closest to 504 × 20? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  37. 37.Which is closest to 303 + 504 + 801? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  38. 38.Round 54.32 to one decimal place. =
  39. 39.Which is closest to 396 + 99 + 401? (a) 800 (b) 1000 (c) 1100 (d) 900
  40. 40.Round 23469 to the nearest thousand.

Answer key

  1. 1200
  2. 21000
  3. 26000
  4. 54000
  5. 18000
  6. 20
  7. 28000
  8. 60
  9. 80
  10. 1700
  11. 1800
  12. 20
  13. 85600
  14. 39000
  15. 80
  16. 1300
  17. 45000
  18. 8000
  19. 88000
  20. 10.4
  21. 6000
  22. 65600
  23. 64000
  24. 22.5
  25. 32000
  26. 14000
  27. 70.9
  28. 57500
  29. 30.3
  30. 6000
  31. 64000
  32. 30
  33. 37.8
  34. 60
  35. 35000
  36. 10000
  37. 1600
  38. 54.3
  39. 900
  40. 23000

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