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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 912 · 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 21302 to the nearest ten.
  2. 2.Which is closest to 296 × 30? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  3. 3.Which is closest to 303 + 105 + 99? (a) 500 (b) 600 (c) 400 (d) 700
  4. 4.Round 15.63 to one decimal place. =
  5. 5.Round 15.56 to one decimal place. =
  6. 6.Which is closest to 902 + 95 + 205? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  7. 7.Round 21697 to the nearest ten.
  8. 8.Which is closest to 2407 ÷ 41? (a) 30 (b) 600 (c) 120 (d) 60
  9. 9.Which is closest to 598 ÷ 19? (a) 30 (b) 15 (c) 60 (d) 300
  10. 10.Round 58.77 to one decimal place. =
  11. 11.Which is closest to 699 × 18? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  12. 12.Round 46.48 to one decimal place. =
  13. 13.Round 38.79 to one decimal place. =
  14. 14.Round 69.88 to one decimal place. =
  15. 15.Which is closest to 604 × 82? (Round each number first.) (a) 480000 (b) 48000 (c) 96000 (d) 4800
  16. 16.Round 16.29 to one decimal place. =
  17. 17.Which is closest to 602 + 802 + 96? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  18. 18.Which is closest to 397 × 79? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  19. 19.Round 34331 to the nearest ten.
  20. 20.Which is closest to 302 × 41? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  21. 21.Which is closest to 595 + 600 + 305? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  22. 22.Which is closest to 601 × 52? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  23. 23.Which is closest to 404 × 18? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  24. 24.Which is closest to 595 ÷ 29? (a) 200 (b) 10 (c) 40 (d) 20
  25. 25.Round 10264 to the nearest ten.
  26. 26.Which is closest to 996 ÷ 49? (a) 10 (b) 40 (c) 20 (d) 200
  27. 27.Which is closest to 701 + 98 + 796? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  28. 28.Round 51.84 to one decimal place. =
  29. 29.Which is closest to 596 ÷ 21? (a) 300 (b) 30 (c) 60 (d) 15
  30. 30.Which is closest to 1398 ÷ 19? (a) 700 (b) 70 (c) 140 (d) 35
  31. 31.Round 80245 to the nearest thousand.
  32. 32.Round 30.21 to one decimal place. =
  33. 33.Which is closest to 399 × 58? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  34. 34.Which is closest to 303 + 401 + 398? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  35. 35.Which is closest to 295 + 603 + 898? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  36. 36.Which is closest to 202 + 97 + 703? (a) 1000 (b) 1100 (c) 1200 (d) 900
  37. 37.Round 11120 to the nearest thousand.
  38. 38.Round 93.38 to one decimal place. =
  39. 39.Which is closest to 396 × 61? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  40. 40.Which is closest to 602 × 41? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000

Answer key

  1. 21300
  2. 9000
  3. 500
  4. 15.6
  5. 15.6
  6. 1200
  7. 21700
  8. 60
  9. 30
  10. 58.8
  11. 14000
  12. 46.5
  13. 38.8
  14. 69.9
  15. 48000
  16. 16.3
  17. 1500
  18. 32000
  19. 34330
  20. 12000
  21. 1500
  22. 30000
  23. 8000
  24. 20
  25. 10260
  26. 20
  27. 1600
  28. 51.8
  29. 30
  30. 70
  31. 80000
  32. 30.2
  33. 24000
  34. 1100
  35. 1800
  36. 1000
  37. 11000
  38. 93.4
  39. 24000
  40. 24000

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