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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 457 · 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 991 ÷ 19? (a) 100 (b) 500 (c) 50 (d) 25
  2. 2.Which is closest to 299 × 89? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  3. 3.Round 46487 to the nearest hundred.
  4. 4.Round 26.72 to one decimal place. =
  5. 5.Which is closest to 603 ÷ 19? (a) 300 (b) 30 (c) 60 (d) 15
  6. 6.Which is closest to 400 + 696 + 501? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  7. 7.Which is closest to 902 × 88? (Round each number first.) (a) 810000 (b) 162000 (c) 8100 (d) 81000
  8. 8.Round 84.79 to one decimal place. =
  9. 9.Round 58327 to the nearest ten.
  10. 10.Which is closest to 503 + 800 + 595? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  11. 11.Round 54.32 to one decimal place. =
  12. 12.Which is closest to 800 × 59? (Round each number first.) (a) 48000 (b) 96000 (c) 4800 (d) 480000
  13. 13.Round 36547 to the nearest ten.
  14. 14.Round 78.33 to one decimal place. =
  15. 15.Which is closest to 903 + 798 + 299? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  16. 16.Which is closest to 1804 ÷ 29? (a) 60 (b) 600 (c) 120 (d) 30
  17. 17.Which is closest to 798 + 104 + 399? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  18. 18.Which is closest to 3997 ÷ 49? (a) 800 (b) 80 (c) 160 (d) 40
  19. 19.Round 74.27 to one decimal place. =
  20. 20.Round 15608 to the nearest ten.
  21. 21.Which is closest to 404 × 80? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
  22. 22.Round 26342 to the nearest thousand.
  23. 23.Which is closest to 1806 ÷ 19? (a) 900 (b) 90 (c) 180 (d) 45
  24. 24.Which is closest to 704 × 31? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  25. 25.Which is closest to 603 × 40? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  26. 26.Round 9832 to the nearest hundred.
  27. 27.Round 35.14 to one decimal place. =
  28. 28.Which is closest to 600 + 704 + 496? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  29. 29.Which is closest to 807 ÷ 41? (a) 200 (b) 40 (c) 10 (d) 20
  30. 30.Round 39.77 to one decimal place. =
  31. 31.Which is closest to 401 + 904 + 400? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  32. 32.Which is closest to 99 + 95 + 398? (a) 800 (b) 500 (c) 700 (d) 600
  33. 33.Round 33.84 to one decimal place. =
  34. 34.Which is closest to 399 × 28? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  35. 35.Round 23549 to the nearest ten.
  36. 36.Which is closest to 297 × 78? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  37. 37.Round 36.93 to one decimal place. =
  38. 38.Round 11783 to the nearest ten.
  39. 39.Round 48.69 to one decimal place. =
  40. 40.Which is closest to 603 + 298 + 904? (a) 2000 (b) 1700 (c) 1900 (d) 1800

Answer key

  1. 50
  2. 27000
  3. 46500
  4. 26.7
  5. 30
  6. 1600
  7. 81000
  8. 84.8
  9. 58330
  10. 1900
  11. 54.3
  12. 48000
  13. 36550
  14. 78.3
  15. 2000
  16. 60
  17. 1300
  18. 80
  19. 74.3
  20. 15610
  21. 32000
  22. 26000
  23. 90
  24. 21000
  25. 24000
  26. 9800
  27. 35.1
  28. 1800
  29. 20
  30. 39.8
  31. 1700
  32. 600
  33. 33.8
  34. 12000
  35. 23550
  36. 24000
  37. 36.9
  38. 11780
  39. 48.7
  40. 1800

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