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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 94 · 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 26151 to the nearest hundred.
  2. 2.Which is closest to 593 ÷ 31? (a) 200 (b) 10 (c) 40 (d) 20
  3. 3.Which is closest to 591 ÷ 31? (a) 200 (b) 10 (c) 40 (d) 20
  4. 4.Which is closest to 792 ÷ 19? (a) 400 (b) 40 (c) 80 (d) 20
  5. 5.Which is closest to 401 × 30? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  6. 6.Which is closest to 600 + 597 + 297? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  7. 7.Which is closest to 803 × 58? (Round each number first.) (a) 480000 (b) 96000 (c) 48000 (d) 4800
  8. 8.Which is closest to 198 + 496 + 702? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  9. 9.Round 88.82 to one decimal place. =
  10. 10.Which is closest to 304 + 604 + 603? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  11. 11.Which is closest to 405 + 701 + 400? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  12. 12.Which is closest to 299 × 92? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  13. 13.Which is closest to 1999 ÷ 41? (a) 50 (b) 100 (c) 25 (d) 500
  14. 14.Which is closest to 800 × 41? (Round each number first.) (a) 3200 (b) 320000 (c) 32000 (d) 64000
  15. 15.Round 78343 to the nearest ten.
  16. 16.Which is closest to 304 + 105 + 796? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  17. 17.Which is closest to 804 × 40? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
  18. 18.Which is closest to 804 × 90? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  19. 19.Which is closest to 502 + 200 + 703? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  20. 20.Which is closest to 2395 ÷ 31? (a) 80 (b) 800 (c) 40 (d) 160
  21. 21.Round 46773 to the nearest ten.
  22. 22.Which is closest to 302 × 32? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  23. 23.Round 70.36 to one decimal place. =
  24. 24.Round 97.13 to one decimal place. =
  25. 25.Which is closest to 199 × 39? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
  26. 26.Which is closest to 897 × 50? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  27. 27.Which is closest to 1194 ÷ 39? (a) 30 (b) 60 (c) 300 (d) 15
  28. 28.Which is closest to 403 + 905 + 300? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  29. 29.Which is closest to 504 × 18? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  30. 30.Which is closest to 996 ÷ 51? (a) 200 (b) 10 (c) 20 (d) 40
  31. 31.Which is closest to 802 + 301 + 698? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  32. 32.Round 95420 to the nearest hundred.
  33. 33.Round 83.93 to one decimal place. =
  34. 34.Which is closest to 1605 ÷ 19? (a) 800 (b) 80 (c) 40 (d) 160
  35. 35.Which is closest to 1205 ÷ 41? (a) 60 (b) 30 (c) 15 (d) 300
  36. 36.Round 35.38 to one decimal place. =
  37. 37.Round 22.24 to one decimal place. =
  38. 38.Round 24.38 to one decimal place. =
  39. 39.Round 58.82 to one decimal place. =
  40. 40.Round 56295 to the nearest thousand.

Answer key

  1. 26200
  2. 20
  3. 20
  4. 40
  5. 12000
  6. 1500
  7. 48000
  8. 1400
  9. 88.8
  10. 1500
  11. 1500
  12. 27000
  13. 50
  14. 32000
  15. 78340
  16. 1200
  17. 32000
  18. 72000
  19. 1400
  20. 80
  21. 46770
  22. 9000
  23. 70.4
  24. 97.1
  25. 8000
  26. 45000
  27. 30
  28. 1600
  29. 10000
  30. 20
  31. 1800
  32. 95400
  33. 83.9
  34. 80
  35. 30
  36. 35.4
  37. 22.2
  38. 24.4
  39. 58.8
  40. 56000

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