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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 734 · 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.Round 38.69 to one decimal place. =
  2. 2.Which is closest to 198 × 81? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  3. 3.Round 44.19 to one decimal place. =
  4. 4.Which is closest to 599 + 597 + 203? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  5. 5.Round 37341 to the nearest thousand.
  6. 6.Which is closest to 195 + 195 + 496? (a) 800 (b) 1100 (c) 1000 (d) 900
  7. 7.Which is closest to 396 × 29? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  8. 8.Round 29743 to the nearest thousand.
  9. 9.Round 94.74 to one decimal place. =
  10. 10.Round 89504 to the nearest hundred.
  11. 11.Round 27133 to the nearest ten.
  12. 12.Round 11.34 to one decimal place. =
  13. 13.Round 86181 to the nearest thousand.
  14. 14.Which is closest to 2499 ÷ 49? (a) 25 (b) 100 (c) 50 (d) 500
  15. 15.Which is closest to 1992 ÷ 49? (a) 400 (b) 20 (c) 40 (d) 80
  16. 16.Which is closest to 297 × 59? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  17. 17.Round 71.94 to one decimal place. =
  18. 18.Which is closest to 1406 ÷ 21? (a) 70 (b) 35 (c) 700 (d) 140
  19. 19.Which is closest to 98 + 395 + 600? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  20. 20.Which is closest to 2003 ÷ 39? (a) 100 (b) 25 (c) 50 (d) 500
  21. 21.Which is closest to 592 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
  22. 22.Round 8073 to the nearest hundred.
  23. 23.Which is closest to 196 + 299 + 697? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  24. 24.Which is closest to 801 × 22? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  25. 25.Round 57.73 to one decimal place. =
  26. 26.Which is closest to 597 × 29? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  27. 27.Round 92.46 to one decimal place. =
  28. 28.Which is closest to 497 × 52? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  29. 29.Which is closest to 403 × 82? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  30. 30.Which is closest to 300 × 81? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  31. 31.Round 47.08 to one decimal place. =
  32. 32.Round 56583 to the nearest thousand.
  33. 33.Which is closest to 398 × 89? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  34. 34.Which is closest to 696 × 59? (Round each number first.) (a) 84000 (b) 420000 (c) 4200 (d) 42000
  35. 35.Round 32392 to the nearest ten.
  36. 36.Which is closest to 695 + 796 + 400? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  37. 37.Which is closest to 696 + 799 + 296? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  38. 38.Which is closest to 397 + 204 + 896? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  39. 39.Round 79.62 to one decimal place. =
  40. 40.Which is closest to 1198 ÷ 21? (a) 30 (b) 600 (c) 120 (d) 60

Answer key

  1. 38.7
  2. 16000
  3. 44.2
  4. 1400
  5. 37000
  6. 900
  7. 12000
  8. 30000
  9. 94.7
  10. 89500
  11. 27130
  12. 11.3
  13. 86000
  14. 50
  15. 40
  16. 18000
  17. 71.9
  18. 70
  19. 1100
  20. 50
  21. 20
  22. 8100
  23. 1200
  24. 16000
  25. 57.7
  26. 18000
  27. 92.5
  28. 25000
  29. 32000
  30. 24000
  31. 47.1
  32. 57000
  33. 36000
  34. 42000
  35. 32390
  36. 1900
  37. 1800
  38. 1500
  39. 79.6
  40. 60

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