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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 156 · 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 597 × 28? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  2. 2.Which is closest to 1203 ÷ 31? (a) 20 (b) 80 (c) 40 (d) 400
  3. 3.Which is closest to 503 × 89? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  4. 4.Which is closest to 303 × 91? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  5. 5.Round 86.31 to one decimal place. =
  6. 6.Round 93.87 to one decimal place. =
  7. 7.Round 70821 to the nearest thousand.
  8. 8.Round 13150 to the nearest thousand.
  9. 9.Which is closest to 1795 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  10. 10.Which is closest to 598 × 48? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  11. 11.Which is closest to 900 × 31? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  12. 12.Which is closest to 1207 ÷ 21? (a) 60 (b) 120 (c) 600 (d) 30
  13. 13.Which is closest to 991 ÷ 19? (a) 25 (b) 100 (c) 50 (d) 500
  14. 14.Round 58.14 to one decimal place. =
  15. 15.Which is closest to 501 × 82? (Round each number first.) (a) 4000 (b) 40000 (c) 80000 (d) 400000
  16. 16.Round 66.36 to one decimal place. =
  17. 17.Which is closest to 800 + 495 + 97? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  18. 18.Which is closest to 199 × 81? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  19. 19.Which is closest to 799 + 99 + 598? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  20. 20.Which is closest to 2699 ÷ 29? (a) 900 (b) 90 (c) 45 (d) 180
  21. 21.Round 43850 to the nearest thousand.
  22. 22.Which is closest to 3509 ÷ 51? (a) 35 (b) 70 (c) 140 (d) 700
  23. 23.Round 23951 to the nearest ten.
  24. 24.Which is closest to 901 × 79? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  25. 25.Which is closest to 101 + 397 + 501? (a) 900 (b) 1100 (c) 1200 (d) 1000
  26. 26.Which is closest to 304 × 38? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  27. 27.Which is closest to 895 + 201 + 595? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  28. 28.Round 77.79 to one decimal place. =
  29. 29.Which is closest to 204 × 18? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  30. 30.Which is closest to 904 + 303 + 796? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  31. 31.Which is closest to 1603 ÷ 19? (a) 800 (b) 40 (c) 160 (d) 80
  32. 32.Round 36.54 to one decimal place. =
  33. 33.Which is closest to 300 + 895 + 496? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  34. 34.Which is closest to 404 × 20? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  35. 35.Round 70040 to the nearest thousand.
  36. 36.Round 85.59 to one decimal place. =
  37. 37.Round 61146 to the nearest thousand.
  38. 38.Which is closest to 603 × 21? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  39. 39.Which is closest to 596 ÷ 19? (a) 300 (b) 60 (c) 30 (d) 15
  40. 40.Which is closest to 2391 ÷ 41? (a) 600 (b) 120 (c) 60 (d) 30

Answer key

  1. 18000
  2. 40
  3. 45000
  4. 27000
  5. 86.3
  6. 93.9
  7. 71000
  8. 13000
  9. 60
  10. 30000
  11. 27000
  12. 60
  13. 50
  14. 58.1
  15. 40000
  16. 66.4
  17. 1400
  18. 16000
  19. 1500
  20. 90
  21. 44000
  22. 70
  23. 23950
  24. 72000
  25. 1000
  26. 12000
  27. 1700
  28. 77.8
  29. 4000
  30. 2000
  31. 80
  32. 36.5
  33. 1700
  34. 8000
  35. 70000
  36. 85.6
  37. 61000
  38. 12000
  39. 30
  40. 60

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