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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 198 · 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 4140 to the nearest hundred.
  2. 2.Which is closest to 796 + 896 + 598? (a) 2400 (b) 2500 (c) 2300 (d) 2200
  3. 3.Round 11.06 to one decimal place. =
  4. 4.Which is closest to 602 × 41? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  5. 5.Round 55.19 to one decimal place. =
  6. 6.Round 52645 to the nearest thousand.
  7. 7.Round 26312 to the nearest hundred.
  8. 8.Which is closest to 204 × 80? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  9. 9.Which is closest to 2803 ÷ 39? (a) 70 (b) 140 (c) 35 (d) 700
  10. 10.Which is closest to 196 × 71? (Round each number first.) (a) 28000 (b) 1400 (c) 140000 (d) 14000
  11. 11.Which is closest to 703 × 60? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  12. 12.Which is closest to 1194 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  13. 13.Which is closest to 802 × 58? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  14. 14.Which is closest to 797 × 18? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  15. 15.Which is closest to 393 ÷ 21? (a) 200 (b) 40 (c) 10 (d) 20
  16. 16.Round 18.66 to one decimal place. =
  17. 17.Round 3537 to the nearest hundred.
  18. 18.Round 80402 to the nearest hundred.
  19. 19.Which is closest to 503 + 398 + 796? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  20. 20.Which is closest to 3198 ÷ 39? (a) 40 (b) 800 (c) 160 (d) 80
  21. 21.Round 80962 to the nearest thousand.
  22. 22.Round 18.93 to one decimal place. =
  23. 23.Which is closest to 599 + 799 + 699? (a) 2100 (b) 2300 (c) 2200 (d) 2000
  24. 24.Which is closest to 195 + 501 + 297? (a) 1000 (b) 900 (c) 1200 (d) 1100
  25. 25.Which is closest to 600 × 22? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  26. 26.Which is closest to 902 + 402 + 200? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  27. 27.Round 14.69 to one decimal place. =
  28. 28.Which is closest to 3204 ÷ 39? (a) 800 (b) 160 (c) 40 (d) 80
  29. 29.Which is closest to 105 + 302 + 503? (a) 800 (b) 1000 (c) 1100 (d) 900
  30. 30.Round 20616 to the nearest thousand.
  31. 31.Which is closest to 195 + 903 + 895? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  32. 32.Which is closest to 798 + 499 + 495? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  33. 33.Which is closest to 201 + 499 + 198? (a) 800 (b) 1000 (c) 1100 (d) 900
  34. 34.Which is closest to 1801 ÷ 29? (a) 600 (b) 60 (c) 30 (d) 120
  35. 35.Which is closest to 96 + 599 + 904? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  36. 36.Which is closest to 895 + 801 + 605? (a) 2400 (b) 2300 (c) 2200 (d) 2500
  37. 37.Which is closest to 2992 ÷ 51? (a) 60 (b) 120 (c) 30 (d) 600
  38. 38.Which is closest to 205 + 203 + 705? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  39. 39.Round 13456 to the nearest thousand.
  40. 40.Which is closest to 799 × 39? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000

Answer key

  1. 4100
  2. 2300
  3. 11.1
  4. 24000
  5. 55.2
  6. 53000
  7. 26300
  8. 16000
  9. 70
  10. 14000
  11. 42000
  12. 60
  13. 48000
  14. 16000
  15. 20
  16. 18.7
  17. 3500
  18. 80400
  19. 1700
  20. 80
  21. 81000
  22. 18.9
  23. 2100
  24. 1000
  25. 12000
  26. 1500
  27. 14.7
  28. 80
  29. 900
  30. 21000
  31. 2000
  32. 1800
  33. 900
  34. 60
  35. 1600
  36. 2300
  37. 60
  38. 1100
  39. 13000
  40. 32000

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