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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 60 · 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 49.73 to one decimal place. =
  2. 2.Which is closest to 96 + 705 + 501? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  3. 3.Which is closest to 801 + 205 + 205? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  4. 4.Round 41.14 to one decimal place. =
  5. 5.Which is closest to 298 × 19? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  6. 6.Which is closest to 599 × 49? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
  7. 7.Which is closest to 698 × 81? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  8. 8.Round 77487 to the nearest ten.
  9. 9.Which is closest to 395 ÷ 19? (a) 200 (b) 10 (c) 40 (d) 20
  10. 10.Round 20.43 to one decimal place. =
  11. 11.Round 90.42 to one decimal place. =
  12. 12.Which is closest to 1000 ÷ 51? (a) 200 (b) 10 (c) 40 (d) 20
  13. 13.Round 83503 to the nearest ten.
  14. 14.Round 36984 to the nearest thousand.
  15. 15.Which is closest to 2700 ÷ 31? (a) 45 (b) 180 (c) 90 (d) 900
  16. 16.Which is closest to 297 × 50? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  17. 17.Round 93.94 to one decimal place. =
  18. 18.Round 37.83 to one decimal place. =
  19. 19.Round 10574 to the nearest ten.
  20. 20.Round 31.91 to one decimal place. =
  21. 21.Which is closest to 598 × 20? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  22. 22.Which is closest to 4503 ÷ 49? (a) 45 (b) 900 (c) 90 (d) 180
  23. 23.Round 34.41 to one decimal place. =
  24. 24.Which is closest to 396 × 40? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  25. 25.Which is closest to 204 × 42? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  26. 26.Which is closest to 302 × 71? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
  27. 27.Which is closest to 99 + 99 + 195? (a) 600 (b) 400 (c) 500 (d) 300
  28. 28.Round 65580 to the nearest thousand.
  29. 29.Which is closest to 1508 ÷ 49? (a) 300 (b) 60 (c) 30 (d) 15
  30. 30.Which is closest to 101 + 102 + 602? (a) 900 (b) 700 (c) 800 (d) 1000
  31. 31.Which is closest to 1002 ÷ 19? (a) 100 (b) 500 (c) 25 (d) 50
  32. 32.Which is closest to 200 + 200 + 403? (a) 1000 (b) 900 (c) 800 (d) 700
  33. 33.Which is closest to 202 × 58? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  34. 34.Round 18.09 to one decimal place. =
  35. 35.Round 61.93 to one decimal place. =
  36. 36.Round 66.13 to one decimal place. =
  37. 37.Which is closest to 402 × 22? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  38. 38.Which is closest to 299 × 78? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  39. 39.Which is closest to 2996 ÷ 51? (a) 600 (b) 60 (c) 120 (d) 30
  40. 40.Round 69.31 to one decimal place. =

Answer key

  1. 49.7
  2. 1300
  3. 1200
  4. 41.1
  5. 6000
  6. 30000
  7. 56000
  8. 77490
  9. 20
  10. 20.4
  11. 90.4
  12. 20
  13. 83500
  14. 37000
  15. 90
  16. 15000
  17. 93.9
  18. 37.8
  19. 10570
  20. 31.9
  21. 12000
  22. 90
  23. 34.4
  24. 16000
  25. 8000
  26. 21000
  27. 400
  28. 66000
  29. 30
  30. 800
  31. 50
  32. 800
  33. 12000
  34. 18.1
  35. 61.9
  36. 66.1
  37. 8000
  38. 24000
  39. 60
  40. 69.3

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