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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 421 · 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 72203 to the nearest hundred.
  2. 2.Round 21.54 to one decimal place. =
  3. 3.Which is closest to 598 ÷ 21? (a) 15 (b) 30 (c) 60 (d) 300
  4. 4.Which is closest to 96 + 505 + 605? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  5. 5.Round 67.17 to one decimal place. =
  6. 6.Which is closest to 598 + 99 + 695? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  7. 7.Round 61682 to the nearest ten.
  8. 8.Round 45.56 to one decimal place. =
  9. 9.Which is closest to 502 × 89? (Round each number first.) (a) 450000 (b) 90000 (c) 45000 (d) 4500
  10. 10.Which is closest to 903 × 82? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  11. 11.Round 57.21 to one decimal place. =
  12. 12.Round 12.64 to one decimal place. =
  13. 13.Round 63.07 to one decimal place. =
  14. 14.Round 10.19 to one decimal place. =
  15. 15.Which is closest to 3591 ÷ 41? (a) 180 (b) 900 (c) 90 (d) 45
  16. 16.Round 78624 to the nearest thousand.
  17. 17.Which is closest to 2003 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  18. 18.Round 56548 to the nearest ten.
  19. 19.Which is closest to 799 × 28? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  20. 20.Which is closest to 799 × 31? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  21. 21.Which is closest to 3998 ÷ 49? (a) 160 (b) 40 (c) 800 (d) 80
  22. 22.Which is closest to 696 + 303 + 799? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  23. 23.Round 19583 to the nearest hundred.
  24. 24.Which is closest to 303 × 61? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  25. 25.Which is closest to 3198 ÷ 39? (a) 80 (b) 40 (c) 800 (d) 160
  26. 26.Round 65523 to the nearest ten.
  27. 27.Which is closest to 601 × 72? (Round each number first.) (a) 84000 (b) 42000 (c) 4200 (d) 420000
  28. 28.Which is closest to 499 + 196 + 797? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  29. 29.Which is closest to 297 × 49? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  30. 30.Which is closest to 705 + 397 + 795? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  31. 31.Which is closest to 296 × 80? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  32. 32.Which is closest to 100 + 102 + 601? (a) 700 (b) 800 (c) 1000 (d) 900
  33. 33.Which is closest to 391 ÷ 21? (a) 40 (b) 20 (c) 200 (d) 10
  34. 34.Which is closest to 1003 ÷ 49? (a) 10 (b) 40 (c) 20 (d) 200
  35. 35.Which is closest to 498 × 70? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  36. 36.Which is closest to 797 × 31? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  37. 37.Round 14.69 to one decimal place. =
  38. 38.Which is closest to 298 × 19? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  39. 39.Which is closest to 296 + 395 + 401? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  40. 40.Which is closest to 299 × 28? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000

Answer key

  1. 72200
  2. 21.5
  3. 30
  4. 1200
  5. 67.2
  6. 1400
  7. 61680
  8. 45.6
  9. 45000
  10. 72000
  11. 57.2
  12. 12.6
  13. 63.1
  14. 10.2
  15. 90
  16. 79000
  17. 50
  18. 56550
  19. 24000
  20. 24000
  21. 80
  22. 1800
  23. 19600
  24. 18000
  25. 80
  26. 65520
  27. 42000
  28. 1500
  29. 15000
  30. 1900
  31. 24000
  32. 800
  33. 20
  34. 20
  35. 35000
  36. 24000
  37. 14.7
  38. 6000
  39. 1100
  40. 9000

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