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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 938 · 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 1196 ÷ 41? (a) 60 (b) 15 (c) 30 (d) 300
  2. 2.Round 64.64 to one decimal place. =
  3. 3.Which is closest to 604 + 899 + 398? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  4. 4.Which is closest to 1507 ÷ 49? (a) 300 (b) 30 (c) 60 (d) 15
  5. 5.Round 35816 to the nearest thousand.
  6. 6.Round 23.22 to one decimal place. =
  7. 7.Which is closest to 804 × 52? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
  8. 8.Round 96.48 to one decimal place. =
  9. 9.Round 96.92 to one decimal place. =
  10. 10.Round 15.23 to one decimal place. =
  11. 11.Which is closest to 401 + 497 + 597? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  12. 12.Round 97.91 to one decimal place. =
  13. 13.Which is closest to 398 + 199 + 695? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  14. 14.Which is closest to 302 + 95 + 205? (a) 800 (b) 600 (c) 500 (d) 700
  15. 15.Round 50.42 to one decimal place. =
  16. 16.Which is closest to 403 × 89? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  17. 17.Round 96636 to the nearest thousand.
  18. 18.Round 30.58 to one decimal place. =
  19. 19.Round 20.68 to one decimal place. =
  20. 20.Which is closest to 296 × 30? (Round each number first.) (a) 18000 (b) 90000 (c) 9000 (d) 900
  21. 21.Which is closest to 198 × 40? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  22. 22.Round 57609 to the nearest ten.
  23. 23.Round 18523 to the nearest ten.
  24. 24.Which is closest to 603 × 72? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  25. 25.Which is closest to 499 × 79? (Round each number first.) (a) 4000 (b) 80000 (c) 400000 (d) 40000
  26. 26.Round 39054 to the nearest hundred.
  27. 27.Round 66.57 to one decimal place. =
  28. 28.Round 57.32 to one decimal place. =
  29. 29.Which is closest to 496 × 89? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  30. 30.Round 55.64 to one decimal place. =
  31. 31.Which is closest to 398 + 699 + 395? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  32. 32.Which is closest to 201 + 400 + 102? (a) 600 (b) 800 (c) 700 (d) 900
  33. 33.Which is closest to 501 × 51? (Round each number first.) (a) 2500 (b) 250000 (c) 25000 (d) 50000
  34. 34.Which is closest to 503 + 796 + 703? (a) 1900 (b) 2200 (c) 2100 (d) 2000
  35. 35.Which is closest to 300 × 39? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  36. 36.Round 86.61 to one decimal place. =
  37. 37.Which is closest to 2401 ÷ 41? (a) 600 (b) 30 (c) 60 (d) 120
  38. 38.Which is closest to 402 × 41? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  39. 39.Round 56084 to the nearest ten.
  40. 40.Round 18.58 to one decimal place. =

Answer key

  1. 30
  2. 64.6
  3. 1900
  4. 30
  5. 36000
  6. 23.2
  7. 40000
  8. 96.5
  9. 96.9
  10. 15.2
  11. 1500
  12. 97.9
  13. 1300
  14. 600
  15. 50.4
  16. 36000
  17. 97000
  18. 30.6
  19. 20.7
  20. 9000
  21. 8000
  22. 57610
  23. 18520
  24. 42000
  25. 40000
  26. 39100
  27. 66.6
  28. 57.3
  29. 45000
  30. 55.6
  31. 1500
  32. 700
  33. 25000
  34. 2000
  35. 12000
  36. 86.6
  37. 60
  38. 16000
  39. 56080
  40. 18.6

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