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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 844 · 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 896 + 305 + 96? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  2. 2.Which is closest to 902 × 60? (Round each number first.) (a) 5400 (b) 540000 (c) 54000 (d) 108000
  3. 3.Round 51.81 to one decimal place. =
  4. 4.Round 13813 to the nearest hundred.
  5. 5.Round 32.51 to one decimal place. =
  6. 6.Round 92.79 to one decimal place. =
  7. 7.Which is closest to 3509 ÷ 49? (a) 700 (b) 35 (c) 70 (d) 140
  8. 8.Round 35908 to the nearest ten.
  9. 9.Which is closest to 701 + 104 + 697? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  10. 10.Which is closest to 3599 ÷ 41? (a) 45 (b) 180 (c) 900 (d) 90
  11. 11.Which is closest to 504 × 91? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  12. 12.Round 12137 to the nearest thousand.
  13. 13.Round 36.83 to one decimal place. =
  14. 14.Round 74468 to the nearest hundred.
  15. 15.Which is closest to 595 + 703 + 502? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  16. 16.Which is closest to 603 × 71? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
  17. 17.Which is closest to 394 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  18. 18.Which is closest to 1798 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  19. 19.Round 59587 to the nearest hundred.
  20. 20.Which is closest to 1607 ÷ 21? (a) 800 (b) 40 (c) 160 (d) 80
  21. 21.Round 86972 to the nearest thousand.
  22. 22.Round 29.11 to one decimal place. =
  23. 23.Round 75.58 to one decimal place. =
  24. 24.Round 73744 to the nearest hundred.
  25. 25.Round 37.22 to one decimal place. =
  26. 26.Which is closest to 897 × 20? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  27. 27.Which is closest to 205 + 901 + 702? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  28. 28.Round 79.24 to one decimal place. =
  29. 29.Which is closest to 400 × 21? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
  30. 30.Round 36176 to the nearest ten.
  31. 31.Which is closest to 2509 ÷ 49? (a) 100 (b) 25 (c) 50 (d) 500
  32. 32.Which is closest to 403 × 28? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  33. 33.Which is closest to 602 × 41? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  34. 34.Round 24217 to the nearest thousand.
  35. 35.Which is closest to 503 × 40? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  36. 36.Which is closest to 803 + 698 + 697? (a) 2100 (b) 2400 (c) 2300 (d) 2200
  37. 37.Round 79.17 to one decimal place. =
  38. 38.Round 84.92 to one decimal place. =
  39. 39.Round 61298 to the nearest thousand.
  40. 40.Which is closest to 1608 ÷ 21? (a) 160 (b) 800 (c) 40 (d) 80

Answer key

  1. 1300
  2. 54000
  3. 51.8
  4. 13800
  5. 32.5
  6. 92.8
  7. 70
  8. 35910
  9. 1500
  10. 90
  11. 45000
  12. 12000
  13. 36.8
  14. 74500
  15. 1800
  16. 42000
  17. 20
  18. 60
  19. 59600
  20. 80
  21. 87000
  22. 29.1
  23. 75.6
  24. 73700
  25. 37.2
  26. 18000
  27. 1800
  28. 79.2
  29. 8000
  30. 36180
  31. 50
  32. 12000
  33. 24000
  34. 24000
  35. 20000
  36. 2200
  37. 79.2
  38. 84.9
  39. 61000
  40. 80

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