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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 495 · 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 3504 ÷ 51? (a) 70 (b) 35 (c) 700 (d) 140
  2. 2.Round 44.63 to one decimal place. =
  3. 3.Round 98.72 to one decimal place. =
  4. 4.Which is closest to 3599 ÷ 39? (a) 900 (b) 90 (c) 45 (d) 180
  5. 5.Which is closest to 396 + 301 + 900? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  6. 6.Round 50.32 to one decimal place. =
  7. 7.Which is closest to 397 × 19? (Round each number first.) (a) 8000 (b) 80000 (c) 800 (d) 16000
  8. 8.Which is closest to 898 × 88? (Round each number first.) (a) 8100 (b) 162000 (c) 810000 (d) 81000
  9. 9.Which is closest to 800 + 503 + 305? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  10. 10.Which is closest to 1494 ÷ 49? (a) 30 (b) 15 (c) 60 (d) 300
  11. 11.Which is closest to 701 + 302 + 403? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  12. 12.Which is closest to 201 + 104 + 901? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  13. 13.Which is closest to 297 × 38? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  14. 14.Round 86167 to the nearest thousand.
  15. 15.Which is closest to 302 × 38? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  16. 16.Round 82.52 to one decimal place. =
  17. 17.Which is closest to 599 + 396 + 299? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  18. 18.Which is closest to 598 × 61? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  19. 19.Round 32.12 to one decimal place. =
  20. 20.Which is closest to 604 + 205 + 797? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  21. 21.Round 16713 to the nearest hundred.
  22. 22.Round 23.23 to one decimal place. =
  23. 23.Round 97.18 to one decimal place. =
  24. 24.Which is closest to 1804 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60
  25. 25.Which is closest to 399 × 92? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  26. 26.Which is closest to 301 + 103 + 601? (a) 900 (b) 1000 (c) 1100 (d) 1200
  27. 27.Round 51.61 to one decimal place. =
  28. 28.Round 19329 to the nearest thousand.
  29. 29.Round 49.77 to one decimal place. =
  30. 30.Round 40.78 to one decimal place. =
  31. 31.Round 59511 to the nearest ten.
  32. 32.Which is closest to 603 + 198 + 704? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  33. 33.Which is closest to 2992 ÷ 51? (a) 60 (b) 30 (c) 600 (d) 120
  34. 34.Round 17018 to the nearest thousand.
  35. 35.Round 5321 to the nearest ten.
  36. 36.Which is closest to 600 ÷ 31? (a) 20 (b) 40 (c) 200 (d) 10
  37. 37.Which is closest to 1604 ÷ 39? (a) 20 (b) 400 (c) 80 (d) 40
  38. 38.Round 35286 to the nearest hundred.
  39. 39.Round 41755 to the nearest thousand.
  40. 40.Round 71353 to the nearest thousand.

Answer key

  1. 70
  2. 44.6
  3. 98.7
  4. 90
  5. 1600
  6. 50.3
  7. 8000
  8. 81000
  9. 1600
  10. 30
  11. 1400
  12. 1200
  13. 12000
  14. 86000
  15. 12000
  16. 82.5
  17. 1300
  18. 36000
  19. 32.1
  20. 1600
  21. 16700
  22. 23.2
  23. 97.2
  24. 60
  25. 36000
  26. 1000
  27. 51.6
  28. 19000
  29. 49.8
  30. 40.8
  31. 59510
  32. 1500
  33. 60
  34. 17000
  35. 5320
  36. 20
  37. 40
  38. 35300
  39. 42000
  40. 71000

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