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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 562 · 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 89771 to the nearest thousand.
  2. 2.Which is closest to 601 × 72? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  3. 3.Round 78474 to the nearest hundred.
  4. 4.Which is closest to 397 ÷ 19? (a) 20 (b) 200 (c) 40 (d) 10
  5. 5.Which is closest to 1197 ÷ 21? (a) 600 (b) 60 (c) 30 (d) 120
  6. 6.Round 64.64 to one decimal place. =
  7. 7.Which is closest to 2694 ÷ 29? (a) 45 (b) 900 (c) 90 (d) 180
  8. 8.Which is closest to 301 × 22? (Round each number first.) (a) 6000 (b) 12000 (c) 60000 (d) 600
  9. 9.Round 11.93 to one decimal place. =
  10. 10.Which is closest to 503 × 70? (Round each number first.) (a) 35000 (b) 70000 (c) 350000 (d) 3500
  11. 11.Which is closest to 801 × 19? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  12. 12.Round 38.84 to one decimal place. =
  13. 13.Round 73343 to the nearest thousand.
  14. 14.Round 88.56 to one decimal place. =
  15. 15.Round 14919 to the nearest thousand.
  16. 16.Which is closest to 1600 ÷ 19? (a) 40 (b) 80 (c) 160 (d) 800
  17. 17.Which is closest to 202 + 202 + 98? (a) 600 (b) 500 (c) 700 (d) 400
  18. 18.Which is closest to 602 ÷ 29? (a) 10 (b) 40 (c) 20 (d) 200
  19. 19.Which is closest to 1504 ÷ 29? (a) 25 (b) 500 (c) 50 (d) 100
  20. 20.Which is closest to 1409 ÷ 19? (a) 35 (b) 140 (c) 70 (d) 700
  21. 21.Which is closest to 4505 ÷ 49? (a) 180 (b) 900 (c) 90 (d) 45
  22. 22.Which is closest to 1199 ÷ 41? (a) 30 (b) 60 (c) 15 (d) 300
  23. 23.Which is closest to 603 × 61? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  24. 24.Round 24.24 to one decimal place. =
  25. 25.Which is closest to 797 + 602 + 698? (a) 2000 (b) 2100 (c) 2200 (d) 2300
  26. 26.Which is closest to 397 + 700 + 204? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  27. 27.Round 24.69 to one decimal place. =
  28. 28.Round 23184 to the nearest thousand.
  29. 29.Which is closest to 598 × 51? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  30. 30.Round 72.69 to one decimal place. =
  31. 31.Which is closest to 200 × 18? (Round each number first.) (a) 4000 (b) 40000 (c) 8000 (d) 400
  32. 32.Which is closest to 2708 ÷ 31? (a) 900 (b) 45 (c) 90 (d) 180
  33. 33.Which is closest to 600 ÷ 21? (a) 60 (b) 300 (c) 30 (d) 15
  34. 34.Which is closest to 397 × 60? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  35. 35.Round 83185 to the nearest hundred.
  36. 36.Round 23.12 to one decimal place. =
  37. 37.Which is closest to 595 ÷ 21? (a) 15 (b) 300 (c) 30 (d) 60
  38. 38.Which is closest to 996 ÷ 49? (a) 200 (b) 10 (c) 20 (d) 40
  39. 39.Which is closest to 2402 ÷ 39? (a) 60 (b) 600 (c) 30 (d) 120
  40. 40.Which is closest to 305 + 303 + 304? (a) 800 (b) 1000 (c) 1100 (d) 900

Answer key

  1. 90000
  2. 42000
  3. 78500
  4. 20
  5. 60
  6. 64.6
  7. 90
  8. 6000
  9. 11.9
  10. 35000
  11. 16000
  12. 38.8
  13. 73000
  14. 88.6
  15. 15000
  16. 80
  17. 500
  18. 20
  19. 50
  20. 70
  21. 90
  22. 30
  23. 36000
  24. 24.2
  25. 2100
  26. 1300
  27. 24.7
  28. 23000
  29. 30000
  30. 72.7
  31. 4000
  32. 90
  33. 30
  34. 24000
  35. 83200
  36. 23.1
  37. 30
  38. 20
  39. 60
  40. 900

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