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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 572 · 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 28050 to the nearest thousand.
  2. 2.Round 12532 to the nearest hundred.
  3. 3.Round 13611 to the nearest ten.
  4. 4.Which is closest to 2000 ÷ 51? (a) 20 (b) 80 (c) 40 (d) 400
  5. 5.Which is closest to 305 + 299 + 97? (a) 900 (b) 800 (c) 700 (d) 600
  6. 6.Which is closest to 501 × 89? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  7. 7.Round 35316 to the nearest ten.
  8. 8.Which is closest to 502 × 59? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  9. 9.Round 43420 to the nearest hundred.
  10. 10.Which is closest to 3607 ÷ 39? (a) 45 (b) 90 (c) 900 (d) 180
  11. 11.Round 4506 to the nearest ten.
  12. 12.Round 50241 to the nearest thousand.
  13. 13.Round 66.41 to one decimal place. =
  14. 14.Which is closest to 504 × 72? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  15. 15.Which is closest to 2105 ÷ 29? (a) 700 (b) 70 (c) 35 (d) 140
  16. 16.Which is closest to 597 × 89? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
  17. 17.Which is closest to 304 × 38? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  18. 18.Round 10.08 to one decimal place. =
  19. 19.Round 96614 to the nearest thousand.
  20. 20.Which is closest to 1598 ÷ 41? (a) 40 (b) 400 (c) 80 (d) 20
  21. 21.Which is closest to 2403 ÷ 41? (a) 120 (b) 30 (c) 60 (d) 600
  22. 22.Round 18664 to the nearest thousand.
  23. 23.Which is closest to 801 + 98 + 300? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  24. 24.Round 29.28 to one decimal place. =
  25. 25.Round 89.88 to one decimal place. =
  26. 26.Round 84020 to the nearest hundred.
  27. 27.Round 34.51 to one decimal place. =
  28. 28.Round 87884 to the nearest thousand.
  29. 29.Round 97.34 to one decimal place. =
  30. 30.Which is closest to 100 + 203 + 97? (a) 500 (b) 300 (c) 400 (d) 600
  31. 31.Which is closest to 397 × 60? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  32. 32.Round 79299 to the nearest hundred.
  33. 33.Which is closest to 2499 ÷ 49? (a) 100 (b) 25 (c) 500 (d) 50
  34. 34.Which is closest to 901 × 61? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  35. 35.Round 33837 to the nearest thousand.
  36. 36.Which is closest to 1992 ÷ 41? (a) 100 (b) 500 (c) 50 (d) 25
  37. 37.Round 36707 to the nearest hundred.
  38. 38.Round 61.21 to one decimal place. =
  39. 39.Round 80.32 to one decimal place. =
  40. 40.Round 95684 to the nearest hundred.

Answer key

  1. 28000
  2. 12500
  3. 13610
  4. 40
  5. 700
  6. 45000
  7. 35320
  8. 30000
  9. 43400
  10. 90
  11. 4510
  12. 50000
  13. 66.4
  14. 35000
  15. 70
  16. 54000
  17. 12000
  18. 10.1
  19. 97000
  20. 40
  21. 60
  22. 19000
  23. 1200
  24. 29.3
  25. 89.9
  26. 84000
  27. 34.5
  28. 88000
  29. 97.3
  30. 400
  31. 24000
  32. 79300
  33. 50
  34. 54000
  35. 34000
  36. 50
  37. 36700
  38. 61.2
  39. 80.3
  40. 95700

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