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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 576 · 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 904 + 304 + 600? (a) 1800 (b) 1700 (c) 2000 (d) 1900
  2. 2.Round 23.63 to one decimal place. =
  3. 3.Round 17361 to the nearest ten.
  4. 4.Which is closest to 801 + 496 + 795? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  5. 5.Round 63712 to the nearest ten.
  6. 6.Which is closest to 799 + 305 + 405? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  7. 7.Which is closest to 3992 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  8. 8.Which is closest to 598 × 89? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  9. 9.Round 32.88 to one decimal place. =
  10. 10.Round 29591 to the nearest ten.
  11. 11.Which is closest to 394 ÷ 19? (a) 200 (b) 40 (c) 10 (d) 20
  12. 12.Which is closest to 496 × 78? (Round each number first.) (a) 40000 (b) 400000 (c) 4000 (d) 80000
  13. 13.Which is closest to 402 + 795 + 400? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  14. 14.Round 36187 to the nearest ten.
  15. 15.Which is closest to 703 × 69? (Round each number first.) (a) 49000 (b) 98000 (c) 490000 (d) 4900
  16. 16.Which is closest to 4004 ÷ 51? (a) 160 (b) 80 (c) 800 (d) 40
  17. 17.Round 73.22 to one decimal place. =
  18. 18.Which is closest to 602 × 21? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  19. 19.Round 89852 to the nearest thousand.
  20. 20.Which is closest to 2392 ÷ 41? (a) 60 (b) 120 (c) 600 (d) 30
  21. 21.Round 83096 to the nearest ten.
  22. 22.Which is closest to 3193 ÷ 41? (a) 40 (b) 80 (c) 800 (d) 160
  23. 23.Round 41389 to the nearest ten.
  24. 24.Which is closest to 397 + 699 + 904? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  25. 25.Which is closest to 499 + 100 + 196? (a) 700 (b) 800 (c) 900 (d) 1000
  26. 26.Round 16.87 to one decimal place. =
  27. 27.Which is closest to 1495 ÷ 29? (a) 500 (b) 100 (c) 50 (d) 25
  28. 28.Which is closest to 899 + 597 + 897? (a) 2600 (b) 2300 (c) 2500 (d) 2400
  29. 29.Round 16475 to the nearest thousand.
  30. 30.Round 17.07 to one decimal place. =
  31. 31.Round 4006 to the nearest hundred.
  32. 32.Which is closest to 697 × 70? (Round each number first.) (a) 49000 (b) 98000 (c) 4900 (d) 490000
  33. 33.Round 97.88 to one decimal place. =
  34. 34.Round 36.51 to one decimal place. =
  35. 35.Which is closest to 895 ÷ 31? (a) 30 (b) 300 (c) 60 (d) 15
  36. 36.Which is closest to 2392 ÷ 29? (a) 800 (b) 80 (c) 160 (d) 40
  37. 37.Which is closest to 3194 ÷ 41? (a) 160 (b) 40 (c) 800 (d) 80
  38. 38.Which is closest to 301 × 78? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  39. 39.Which is closest to 405 + 300 + 802? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  40. 40.Round 53.44 to one decimal place. =

Answer key

  1. 1800
  2. 23.6
  3. 17360
  4. 2100
  5. 63710
  6. 1500
  7. 80
  8. 54000
  9. 32.9
  10. 29590
  11. 20
  12. 40000
  13. 1600
  14. 36190
  15. 49000
  16. 80
  17. 73.2
  18. 12000
  19. 90000
  20. 60
  21. 83100
  22. 80
  23. 41390
  24. 2000
  25. 800
  26. 16.9
  27. 50
  28. 2400
  29. 16000
  30. 17.1
  31. 4000
  32. 49000
  33. 97.9
  34. 36.5
  35. 30
  36. 80
  37. 80
  38. 24000
  39. 1500
  40. 53.4

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