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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 31 · 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 601 × 41? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  2. 2.Which is closest to 396 × 89? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  3. 3.Which is closest to 2409 ÷ 41? (a) 30 (b) 120 (c) 60 (d) 600
  4. 4.Round 29291 to the nearest hundred.
  5. 5.Which is closest to 1005 ÷ 21? (a) 500 (b) 25 (c) 50 (d) 100
  6. 6.Round 90.34 to one decimal place. =
  7. 7.Round 47848 to the nearest hundred.
  8. 8.Which is closest to 1200 ÷ 29? (a) 80 (b) 20 (c) 400 (d) 40
  9. 9.Which is closest to 402 × 69? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  10. 10.Round 88342 to the nearest hundred.
  11. 11.Which is closest to 504 + 197 + 98? (a) 700 (b) 900 (c) 800 (d) 1000
  12. 12.Which is closest to 996 ÷ 49? (a) 20 (b) 200 (c) 40 (d) 10
  13. 13.Round 27.88 to one decimal place. =
  14. 14.Which is closest to 798 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  15. 15.Which is closest to 3196 ÷ 39? (a) 160 (b) 80 (c) 40 (d) 800
  16. 16.Which is closest to 2099 ÷ 29? (a) 70 (b) 35 (c) 700 (d) 140
  17. 17.Which is closest to 2094 ÷ 31? (a) 140 (b) 35 (c) 700 (d) 70
  18. 18.Round 8780 to the nearest hundred.
  19. 19.Which is closest to 704 + 895 + 296? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  20. 20.Which is closest to 600 × 91? (Round each number first.) (a) 540000 (b) 5400 (c) 54000 (d) 108000
  21. 21.Which is closest to 398 × 39? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  22. 22.Round 21803 to the nearest ten.
  23. 23.Which is closest to 1793 ÷ 21? (a) 45 (b) 900 (c) 180 (d) 90
  24. 24.Round 80060 to the nearest thousand.
  25. 25.Which is closest to 298 + 300 + 895? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  26. 26.Which is closest to 704 × 18? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  27. 27.Which is closest to 600 × 28? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  28. 28.Which is closest to 597 + 704 + 702? (a) 1900 (b) 2200 (c) 2100 (d) 2000
  29. 29.Which is closest to 3595 ÷ 41? (a) 900 (b) 90 (c) 180 (d) 45
  30. 30.Which is closest to 1206 ÷ 39? (a) 15 (b) 300 (c) 30 (d) 60
  31. 31.Round 70908 to the nearest hundred.
  32. 32.Which is closest to 796 + 201 + 904? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  33. 33.Round 90.94 to one decimal place. =
  34. 34.Round 95156 to the nearest hundred.
  35. 35.Round 24334 to the nearest thousand.
  36. 36.Which is closest to 2005 ÷ 51? (a) 80 (b) 400 (c) 40 (d) 20
  37. 37.Which is closest to 704 + 603 + 804? (a) 2000 (b) 2100 (c) 2300 (d) 2200
  38. 38.Which is closest to 797 × 30? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  39. 39.Round 71532 to the nearest hundred.
  40. 40.Which is closest to 199 × 59? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000

Answer key

  1. 24000
  2. 36000
  3. 60
  4. 29300
  5. 50
  6. 90.3
  7. 47800
  8. 40
  9. 28000
  10. 88300
  11. 800
  12. 20
  13. 27.9
  14. 16000
  15. 80
  16. 70
  17. 70
  18. 8800
  19. 1900
  20. 54000
  21. 16000
  22. 21800
  23. 90
  24. 80000
  25. 1500
  26. 14000
  27. 18000
  28. 2000
  29. 90
  30. 30
  31. 70900
  32. 1900
  33. 90.9
  34. 95200
  35. 24000
  36. 40
  37. 2100
  38. 24000
  39. 71500
  40. 12000

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