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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 717 · 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 799 × 60? (Round each number first.) (a) 4800 (b) 480000 (c) 96000 (d) 48000
  2. 2.Which is closest to 396 × 79? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  3. 3.Round 16.08 to one decimal place. =
  4. 4.Which is closest to 799 × 51? (Round each number first.) (a) 4000 (b) 400000 (c) 40000 (d) 80000
  5. 5.Round 86523 to the nearest ten.
  6. 6.Round 70294 to the nearest thousand.
  7. 7.Round 93.79 to one decimal place. =
  8. 8.Which is closest to 2692 ÷ 31? (a) 900 (b) 180 (c) 90 (d) 45
  9. 9.Which is closest to 1393 ÷ 19? (a) 70 (b) 140 (c) 700 (d) 35
  10. 10.Which is closest to 792 ÷ 39? (a) 10 (b) 20 (c) 40 (d) 200
  11. 11.Which is closest to 1593 ÷ 41? (a) 40 (b) 20 (c) 80 (d) 400
  12. 12.Which is closest to 200 × 38? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  13. 13.Round 42.68 to one decimal place. =
  14. 14.Which is closest to 303 × 80? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  15. 15.Which is closest to 796 + 796 + 296? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  16. 16.Which is closest to 497 + 700 + 899? (a) 2000 (b) 2100 (c) 2300 (d) 2200
  17. 17.Round 11.83 to one decimal place. =
  18. 18.Round 95.67 to one decimal place. =
  19. 19.Round 29.68 to one decimal place. =
  20. 20.Which is closest to 803 + 897 + 495? (a) 2400 (b) 2200 (c) 2300 (d) 2100
  21. 21.Round 79365 to the nearest hundred.
  22. 22.Which is closest to 1794 ÷ 19? (a) 900 (b) 180 (c) 90 (d) 45
  23. 23.Which is closest to 604 × 79? (Round each number first.) (a) 48000 (b) 4800 (c) 480000 (d) 96000
  24. 24.Round 11206 to the nearest ten.
  25. 25.Round 18198 to the nearest thousand.
  26. 26.Which is closest to 196 × 62? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  27. 27.Round 25893 to the nearest hundred.
  28. 28.Which is closest to 897 + 198 + 199? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  29. 29.Round 25489 to the nearest thousand.
  30. 30.Which is closest to 697 + 501 + 502? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  31. 31.Round 37744 to the nearest hundred.
  32. 32.Which is closest to 197 × 78? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
  33. 33.Round 28954 to the nearest hundred.
  34. 34.Round 17.17 to one decimal place. =
  35. 35.Which is closest to 991 ÷ 19? (a) 100 (b) 50 (c) 500 (d) 25
  36. 36.Round 74.57 to one decimal place. =
  37. 37.Round 94.93 to one decimal place. =
  38. 38.Which is closest to 599 × 22? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  39. 39.Round 77.22 to one decimal place. =
  40. 40.Which is closest to 4498 ÷ 51? (a) 45 (b) 90 (c) 180 (d) 900

Answer key

  1. 48000
  2. 32000
  3. 16.1
  4. 40000
  5. 86520
  6. 70000
  7. 93.8
  8. 90
  9. 70
  10. 20
  11. 40
  12. 8000
  13. 42.7
  14. 24000
  15. 1900
  16. 2100
  17. 11.8
  18. 95.7
  19. 29.7
  20. 2200
  21. 79400
  22. 90
  23. 48000
  24. 11210
  25. 18000
  26. 12000
  27. 25900
  28. 1300
  29. 25000
  30. 1700
  31. 37700
  32. 16000
  33. 29000
  34. 17.2
  35. 50
  36. 74.6
  37. 94.9
  38. 12000
  39. 77.2
  40. 90

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