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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 682 · 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 64.78 to one decimal place. =
  2. 2.Which is closest to 205 + 796 + 404? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  3. 3.Which is closest to 600 + 695 + 797? (a) 2000 (b) 2100 (c) 2200 (d) 2300
  4. 4.Which is closest to 796 × 70? (Round each number first.) (a) 56000 (b) 112000 (c) 5600 (d) 560000
  5. 5.Round 12268 to the nearest thousand.
  6. 6.Which is closest to 597 × 78? (Round each number first.) (a) 48000 (b) 96000 (c) 480000 (d) 4800
  7. 7.Which is closest to 305 + 802 + 703? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  8. 8.Which is closest to 1192 ÷ 39? (a) 30 (b) 300 (c) 60 (d) 15
  9. 9.Which is closest to 498 × 81? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  10. 10.Round 4643 to the nearest ten.
  11. 11.Which is closest to 299 × 28? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  12. 12.Round 82078 to the nearest ten.
  13. 13.Which is closest to 500 × 38? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  14. 14.Which is closest to 1398 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  15. 15.Which is closest to 804 × 32? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  16. 16.Round 35237 to the nearest thousand.
  17. 17.Round 33521 to the nearest hundred.
  18. 18.Which is closest to 700 × 31? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  19. 19.Round 22.34 to one decimal place. =
  20. 20.Round 45.36 to one decimal place. =
  21. 21.Which is closest to 302 × 40? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  22. 22.Round 99.19 to one decimal place. =
  23. 23.Round 38910 to the nearest hundred.
  24. 24.Which is closest to 1004 ÷ 51? (a) 10 (b) 40 (c) 200 (d) 20
  25. 25.Round 23908 to the nearest thousand.
  26. 26.Which is closest to 3191 ÷ 41? (a) 40 (b) 160 (c) 80 (d) 800
  27. 27.Round 13.48 to one decimal place. =
  28. 28.Which is closest to 498 × 88? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  29. 29.Which is closest to 3496 ÷ 49? (a) 140 (b) 35 (c) 70 (d) 700
  30. 30.Round 51655 to the nearest hundred.
  31. 31.Which is closest to 1596 ÷ 39? (a) 400 (b) 80 (c) 40 (d) 20
  32. 32.Which is closest to 1800 ÷ 31? (a) 120 (b) 30 (c) 60 (d) 600
  33. 33.Round 97181 to the nearest thousand.
  34. 34.Which is closest to 202 + 902 + 705? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  35. 35.Which is closest to 299 × 79? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  36. 36.Which is closest to 1998 ÷ 51? (a) 80 (b) 40 (c) 20 (d) 400
  37. 37.Which is closest to 700 + 605 + 897? (a) 2200 (b) 2300 (c) 2400 (d) 2100
  38. 38.Which is closest to 500 + 298 + 796? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  39. 39.Which is closest to 2794 ÷ 41? (a) 35 (b) 700 (c) 70 (d) 140
  40. 40.Which is closest to 1609 ÷ 19? (a) 800 (b) 80 (c) 160 (d) 40

Answer key

  1. 64.8
  2. 1400
  3. 2100
  4. 56000
  5. 12000
  6. 48000
  7. 1800
  8. 30
  9. 40000
  10. 4640
  11. 9000
  12. 82080
  13. 20000
  14. 70
  15. 24000
  16. 35000
  17. 33500
  18. 21000
  19. 22.3
  20. 45.4
  21. 12000
  22. 99.2
  23. 38900
  24. 20
  25. 24000
  26. 80
  27. 13.5
  28. 45000
  29. 70
  30. 51700
  31. 40
  32. 60
  33. 97000
  34. 1800
  35. 24000
  36. 40
  37. 2200
  38. 1600
  39. 70
  40. 80

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