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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 931 · 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 796 + 298 + 604? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  2. 2.Round 48354 to the nearest thousand.
  3. 3.Which is closest to 799 × 21? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  4. 4.Which is closest to 304 + 703 + 803? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  5. 5.Which is closest to 1798 ÷ 31? (a) 60 (b) 120 (c) 30 (d) 600
  6. 6.Round 70.47 to one decimal place. =
  7. 7.Which is closest to 609 ÷ 19? (a) 300 (b) 30 (c) 60 (d) 15
  8. 8.Which is closest to 298 × 69? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  9. 9.Which is closest to 804 ÷ 19? (a) 40 (b) 20 (c) 400 (d) 80
  10. 10.Round 53616 to the nearest hundred.
  11. 11.Round 45016 to the nearest hundred.
  12. 12.Round 8337 to the nearest hundred.
  13. 13.Which is closest to 503 × 51? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000
  14. 14.Which is closest to 404 × 18? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
  15. 15.Round 29.74 to one decimal place. =
  16. 16.Round 51370 to the nearest thousand.
  17. 17.Round 76313 to the nearest hundred.
  18. 18.Which is closest to 297 × 20? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  19. 19.Which is closest to 705 + 503 + 695? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  20. 20.Which is closest to 298 × 71? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  21. 21.Which is closest to 398 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  22. 22.Which is closest to 1206 ÷ 41? (a) 30 (b) 60 (c) 15 (d) 300
  23. 23.Round 78283 to the nearest hundred.
  24. 24.Which is closest to 406 ÷ 21? (a) 40 (b) 20 (c) 10 (d) 200
  25. 25.Round 13664 to the nearest thousand.
  26. 26.Which is closest to 703 + 303 + 903? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  27. 27.Which is closest to 905 + 801 + 304? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  28. 28.Which is closest to 393 ÷ 21? (a) 40 (b) 20 (c) 200 (d) 10
  29. 29.Round 3259 to the nearest ten.
  30. 30.Round 73.67 to one decimal place. =
  31. 31.Which is closest to 104 + 800 + 905? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  32. 32.Round 47.81 to one decimal place. =
  33. 33.Which is closest to 201 + 801 + 601? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  34. 34.Which is closest to 799 × 28? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  35. 35.Which is closest to 1404 ÷ 21? (a) 700 (b) 70 (c) 35 (d) 140
  36. 36.Which is closest to 1602 ÷ 39? (a) 20 (b) 40 (c) 400 (d) 80
  37. 37.Which is closest to 797 + 404 + 204? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  38. 38.Which is closest to 598 + 299 + 400? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  39. 39.Which is closest to 2000 ÷ 51? (a) 20 (b) 40 (c) 400 (d) 80
  40. 40.Which is closest to 603 × 29? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000

Answer key

  1. 1700
  2. 48000
  3. 16000
  4. 1800
  5. 60
  6. 70.5
  7. 30
  8. 21000
  9. 40
  10. 53600
  11. 45000
  12. 8300
  13. 25000
  14. 8000
  15. 29.7
  16. 51000
  17. 76300
  18. 6000
  19. 1900
  20. 21000
  21. 20
  22. 30
  23. 78300
  24. 20
  25. 14000
  26. 1900
  27. 2000
  28. 20
  29. 3260
  30. 73.7
  31. 1800
  32. 47.8
  33. 1600
  34. 24000
  35. 70
  36. 40
  37. 1400
  38. 1300
  39. 40
  40. 18000

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