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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 315 · 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 3495 ÷ 49? (a) 70 (b) 700 (c) 140 (d) 35
  2. 2.Which is closest to 807 ÷ 41? (a) 200 (b) 20 (c) 10 (d) 40
  3. 3.Round 86.81 to one decimal place. =
  4. 4.Round 66473 to the nearest thousand.
  5. 5.Round 13112 to the nearest hundred.
  6. 6.Which is closest to 305 + 598 + 96? (a) 1100 (b) 900 (c) 1200 (d) 1000
  7. 7.Round 65.66 to one decimal place. =
  8. 8.Round 54642 to the nearest hundred.
  9. 9.Which is closest to 795 + 105 + 201? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  10. 10.Round 11544 to the nearest thousand.
  11. 11.Round 28.21 to one decimal place. =
  12. 12.Which is closest to 802 × 60? (Round each number first.) (a) 4800 (b) 48000 (c) 480000 (d) 96000
  13. 13.Which is closest to 603 + 595 + 597? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  14. 14.Round 60.91 to one decimal place. =
  15. 15.Round 46.74 to one decimal place. =
  16. 16.Round 97323 to the nearest ten.
  17. 17.Which is closest to 2000 ÷ 51? (a) 80 (b) 400 (c) 20 (d) 40
  18. 18.Round 82016 to the nearest ten.
  19. 19.Which is closest to 603 × 71? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  20. 20.Round 16.93 to one decimal place. =
  21. 21.Which is closest to 802 ÷ 41? (a) 10 (b) 200 (c) 20 (d) 40
  22. 22.Which is closest to 396 + 397 + 597? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  23. 23.Which is closest to 398 × 29? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  24. 24.Which is closest to 598 × 31? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  25. 25.Round 71.47 to one decimal place. =
  26. 26.Round 22.67 to one decimal place. =
  27. 27.Which is closest to 1594 ÷ 21? (a) 160 (b) 800 (c) 80 (d) 40
  28. 28.Which is closest to 600 ÷ 21? (a) 15 (b) 60 (c) 30 (d) 300
  29. 29.Round 66294 to the nearest ten.
  30. 30.Round 37.69 to one decimal place. =
  31. 31.Which is closest to 504 × 40? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  32. 32.Which is closest to 197 × 31? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  33. 33.Which is closest to 504 × 31? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  34. 34.Which is closest to 199 × 41? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  35. 35.Which is closest to 497 + 103 + 901? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  36. 36.Which is closest to 601 × 52? (Round each number first.) (a) 30000 (b) 300000 (c) 3000 (d) 60000
  37. 37.Which is closest to 201 × 70? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  38. 38.Round 68.89 to one decimal place. =
  39. 39.Which is closest to 800 × 39? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
  40. 40.Which is closest to 1607 ÷ 21? (a) 80 (b) 40 (c) 160 (d) 800

Answer key

  1. 70
  2. 20
  3. 86.8
  4. 66000
  5. 13100
  6. 1000
  7. 65.7
  8. 54600
  9. 1100
  10. 12000
  11. 28.2
  12. 48000
  13. 1800
  14. 60.9
  15. 46.7
  16. 97320
  17. 40
  18. 82020
  19. 42000
  20. 16.9
  21. 20
  22. 1400
  23. 12000
  24. 18000
  25. 71.5
  26. 22.7
  27. 80
  28. 30
  29. 66290
  30. 37.7
  31. 20000
  32. 6000
  33. 15000
  34. 8000
  35. 1500
  36. 30000
  37. 14000
  38. 68.9
  39. 32000
  40. 80

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