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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 865 · 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 301 + 697 + 599? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  2. 2.Which is closest to 301 × 21? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  3. 3.Which is closest to 697 × 28? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000
  4. 4.Which is closest to 501 × 82? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
  5. 5.Which is closest to 904 + 901 + 601? (a) 2300 (b) 2500 (c) 2400 (d) 2600
  6. 6.Which is closest to 298 × 79? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  7. 7.Which is closest to 797 + 696 + 305? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  8. 8.Which is closest to 198 × 18? (Round each number first.) (a) 40000 (b) 8000 (c) 4000 (d) 400
  9. 9.Round 25.52 to one decimal place. =
  10. 10.Which is closest to 1398 ÷ 19? (a) 70 (b) 140 (c) 35 (d) 700
  11. 11.Round 79948 to the nearest ten.
  12. 12.Round 29.32 to one decimal place. =
  13. 13.Which is closest to 593 ÷ 31? (a) 40 (b) 200 (c) 20 (d) 10
  14. 14.Which is closest to 1007 ÷ 49? (a) 200 (b) 10 (c) 40 (d) 20
  15. 15.Round 47768 to the nearest ten.
  16. 16.Which is closest to 802 + 496 + 295? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  17. 17.Round 67580 to the nearest hundred.
  18. 18.Which is closest to 699 × 20? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  19. 19.Round 88640 to the nearest hundred.
  20. 20.Which is closest to 994 ÷ 51? (a) 200 (b) 40 (c) 10 (d) 20
  21. 21.Round 19.82 to one decimal place. =
  22. 22.Which is closest to 400 × 71? (Round each number first.) (a) 280000 (b) 2800 (c) 56000 (d) 28000
  23. 23.Which is closest to 901 × 41? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
  24. 24.Which is closest to 2009 ÷ 41? (a) 500 (b) 100 (c) 50 (d) 25
  25. 25.Which is closest to 902 × 71? (Round each number first.) (a) 630000 (b) 63000 (c) 6300 (d) 126000
  26. 26.Round 26716 to the nearest thousand.
  27. 27.Which is closest to 297 × 18? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  28. 28.Round 76944 to the nearest ten.
  29. 29.Which is closest to 2092 ÷ 31? (a) 70 (b) 140 (c) 700 (d) 35
  30. 30.Which is closest to 597 ÷ 29? (a) 40 (b) 200 (c) 10 (d) 20
  31. 31.Which is closest to 802 × 41? (Round each number first.) (a) 320000 (b) 32000 (c) 3200 (d) 64000
  32. 32.Round 36806 to the nearest ten.
  33. 33.Which is closest to 697 × 19? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  34. 34.Which is closest to 599 + 497 + 97? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  35. 35.Round 35369 to the nearest ten.
  36. 36.Which is closest to 393 ÷ 21? (a) 10 (b) 200 (c) 40 (d) 20
  37. 37.Round 47869 to the nearest ten.
  38. 38.Round 24.48 to one decimal place. =
  39. 39.Which is closest to 809 ÷ 39? (a) 200 (b) 10 (c) 20 (d) 40
  40. 40.Which is closest to 402 × 29? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000

Answer key

  1. 1600
  2. 6000
  3. 21000
  4. 40000
  5. 2400
  6. 24000
  7. 1800
  8. 4000
  9. 25.5
  10. 70
  11. 79950
  12. 29.3
  13. 20
  14. 20
  15. 47770
  16. 1600
  17. 67600
  18. 14000
  19. 88600
  20. 20
  21. 19.8
  22. 28000
  23. 36000
  24. 50
  25. 63000
  26. 27000
  27. 6000
  28. 76940
  29. 70
  30. 20
  31. 32000
  32. 36810
  33. 14000
  34. 1200
  35. 35370
  36. 20
  37. 47870
  38. 24.5
  39. 20
  40. 12000

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