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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 531 · 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 198 × 39? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
  2. 2.Which is closest to 300 × 19? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  3. 3.Which is closest to 903 + 204 + 205? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  4. 4.Which is closest to 1792 ÷ 19? (a) 900 (b) 180 (c) 90 (d) 45
  5. 5.Round 96873 to the nearest hundred.
  6. 6.Round 27202 to the nearest hundred.
  7. 7.Round 75637 to the nearest ten.
  8. 8.Round 58.69 to one decimal place. =
  9. 9.Which is closest to 904 × 71? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  10. 10.Which is closest to 701 × 58? (Round each number first.) (a) 420000 (b) 42000 (c) 84000 (d) 4200
  11. 11.Round 41.86 to one decimal place. =
  12. 12.Round 36.31 to one decimal place. =
  13. 13.Which is closest to 4508 ÷ 49? (a) 90 (b) 45 (c) 180 (d) 900
  14. 14.Which is closest to 198 + 195 + 605? (a) 1100 (b) 1200 (c) 900 (d) 1000
  15. 15.Which is closest to 296 × 70? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  16. 16.Which is closest to 4500 ÷ 51? (a) 45 (b) 90 (c) 180 (d) 900
  17. 17.Which is closest to 1596 ÷ 19? (a) 800 (b) 160 (c) 80 (d) 40
  18. 18.Round 87.53 to one decimal place. =
  19. 19.Which is closest to 1796 ÷ 21? (a) 90 (b) 180 (c) 900 (d) 45
  20. 20.Round 71027 to the nearest ten.
  21. 21.Which is closest to 196 × 91? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  22. 22.Which is closest to 696 + 896 + 595? (a) 2100 (b) 2300 (c) 2400 (d) 2200
  23. 23.Round 13.76 to one decimal place. =
  24. 24.Which is closest to 604 + 503 + 297? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  25. 25.Which is closest to 596 × 80? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  26. 26.Which is closest to 2703 ÷ 31? (a) 900 (b) 45 (c) 180 (d) 90
  27. 27.Which is closest to 600 × 71? (Round each number first.) (a) 42000 (b) 84000 (c) 4200 (d) 420000
  28. 28.Which is closest to 198 × 79? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  29. 29.Round 73.47 to one decimal place. =
  30. 30.Which is closest to 1200 ÷ 31? (a) 400 (b) 80 (c) 20 (d) 40
  31. 31.Which is closest to 903 × 79? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  32. 32.Which is closest to 999 ÷ 19? (a) 500 (b) 25 (c) 100 (d) 50
  33. 33.Round 69.06 to one decimal place. =
  34. 34.Which is closest to 101 + 104 + 298? (a) 600 (b) 400 (c) 500 (d) 700
  35. 35.Round 93.21 to one decimal place. =
  36. 36.Round 83388 to the nearest hundred.
  37. 37.Which is closest to 804 × 80? (Round each number first.) (a) 6400 (b) 64000 (c) 128000 (d) 640000
  38. 38.Round 53403 to the nearest thousand.
  39. 39.Which is closest to 404 × 61? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  40. 40.Round 62213 to the nearest hundred.

Answer key

  1. 8000
  2. 6000
  3. 1300
  4. 90
  5. 96900
  6. 27200
  7. 75640
  8. 58.7
  9. 63000
  10. 42000
  11. 41.9
  12. 36.3
  13. 90
  14. 1000
  15. 21000
  16. 90
  17. 80
  18. 87.5
  19. 90
  20. 71030
  21. 18000
  22. 2200
  23. 13.8
  24. 1400
  25. 48000
  26. 90
  27. 42000
  28. 16000
  29. 73.5
  30. 40
  31. 72000
  32. 50
  33. 69.1
  34. 500
  35. 93.2
  36. 83400
  37. 64000
  38. 53000
  39. 24000
  40. 62200

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