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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 391 · 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 399 × 78? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  2. 2.Which is closest to 502 × 49? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000
  3. 3.Round 13.67 to one decimal place. =
  4. 4.Round 51.44 to one decimal place. =
  5. 5.Round 10093 to the nearest ten.
  6. 6.Which is closest to 604 + 105 + 695? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  7. 7.Which is closest to 198 × 88? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  8. 8.Round 68.57 to one decimal place. =
  9. 9.Which is closest to 400 × 42? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  10. 10.Round 95.33 to one decimal place. =
  11. 11.Which is closest to 402 × 32? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  12. 12.Round 63781 to the nearest hundred.
  13. 13.Which is closest to 398 × 71? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  14. 14.Round 65.56 to one decimal place. =
  15. 15.Which is closest to 197 + 396 + 498? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  16. 16.Which is closest to 2795 ÷ 41? (a) 700 (b) 70 (c) 140 (d) 35
  17. 17.Round 15739 to the nearest ten.
  18. 18.Round 84.11 to one decimal place. =
  19. 19.Which is closest to 2992 ÷ 51? (a) 600 (b) 30 (c) 60 (d) 120
  20. 20.Which is closest to 1808 ÷ 29? (a) 600 (b) 30 (c) 120 (d) 60
  21. 21.Which is closest to 895 + 602 + 798? (a) 2500 (b) 2300 (c) 2200 (d) 2400
  22. 22.Which is closest to 497 × 28? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  23. 23.Which is closest to 201 + 495 + 405? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  24. 24.Which is closest to 601 × 80? (Round each number first.) (a) 4800 (b) 480000 (c) 96000 (d) 48000
  25. 25.Which is closest to 605 ÷ 19? (a) 30 (b) 60 (c) 300 (d) 15
  26. 26.Round 58.11 to one decimal place. =
  27. 27.Round 98894 to the nearest thousand.
  28. 28.Which is closest to 799 × 88? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  29. 29.Round 40099 to the nearest thousand.
  30. 30.Round 96173 to the nearest hundred.
  31. 31.Which is closest to 304 × 68? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  32. 32.Which is closest to 796 × 19? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  33. 33.Which is closest to 805 + 200 + 96? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  34. 34.Round 4377 to the nearest thousand.
  35. 35.Which is closest to 1205 ÷ 41? (a) 60 (b) 300 (c) 30 (d) 15
  36. 36.Which is closest to 900 × 29? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  37. 37.Which is closest to 201 × 38? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  38. 38.Which is closest to 409 ÷ 19? (a) 200 (b) 20 (c) 10 (d) 40
  39. 39.Round 77.48 to one decimal place. =
  40. 40.Round 51.12 to one decimal place. =

Answer key

  1. 32000
  2. 25000
  3. 13.7
  4. 51.4
  5. 10090
  6. 1400
  7. 18000
  8. 68.6
  9. 16000
  10. 95.3
  11. 12000
  12. 63800
  13. 28000
  14. 65.6
  15. 1100
  16. 70
  17. 15740
  18. 84.1
  19. 60
  20. 60
  21. 2300
  22. 15000
  23. 1100
  24. 48000
  25. 30
  26. 58.1
  27. 99000
  28. 72000
  29. 40000
  30. 96200
  31. 21000
  32. 16000
  33. 1100
  34. 4000
  35. 30
  36. 27000
  37. 8000
  38. 20
  39. 77.5
  40. 51.1

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