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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 179 · 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 804 × 42? (Round each number first.) (a) 32000 (b) 64000 (c) 3200 (d) 320000
  2. 2.Which is closest to 698 × 18? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  3. 3.Round 49.28 to one decimal place. =
  4. 4.Round 34.79 to one decimal place. =
  5. 5.Round 50289 to the nearest ten.
  6. 6.Round 12.52 to one decimal place. =
  7. 7.Which is closest to 200 × 22? (Round each number first.) (a) 40000 (b) 8000 (c) 4000 (d) 400
  8. 8.Round 77.61 to one decimal place. =
  9. 9.Which is closest to 200 + 295 + 405? (a) 800 (b) 1100 (c) 900 (d) 1000
  10. 10.Round 10409 to the nearest ten.
  11. 11.Which is closest to 898 × 32? (Round each number first.) (a) 2700 (b) 27000 (c) 270000 (d) 54000
  12. 12.Which is closest to 3991 ÷ 49? (a) 160 (b) 800 (c) 80 (d) 40
  13. 13.Round 89137 to the nearest hundred.
  14. 14.Which is closest to 1192 ÷ 41? (a) 15 (b) 300 (c) 60 (d) 30
  15. 15.Which is closest to 1507 ÷ 49? (a) 15 (b) 300 (c) 30 (d) 60
  16. 16.Which is closest to 898 × 18? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  17. 17.Which is closest to 302 × 92? (Round each number first.) (a) 2700 (b) 27000 (c) 270000 (d) 54000
  18. 18.Round 52.62 to one decimal place. =
  19. 19.Which is closest to 297 + 201 + 403? (a) 1000 (b) 800 (c) 1100 (d) 900
  20. 20.Round 25917 to the nearest thousand.
  21. 21.Round 37712 to the nearest thousand.
  22. 22.Which is closest to 608 ÷ 19? (a) 60 (b) 300 (c) 15 (d) 30
  23. 23.Round 37729 to the nearest thousand.
  24. 24.Which is closest to 1005 ÷ 21? (a) 50 (b) 25 (c) 500 (d) 100
  25. 25.Round 44543 to the nearest thousand.
  26. 26.Which is closest to 2400 ÷ 31? (a) 80 (b) 160 (c) 800 (d) 40
  27. 27.Which is closest to 296 + 904 + 405? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  28. 28.Round 52.08 to one decimal place. =
  29. 29.Which is closest to 800 ÷ 39? (a) 200 (b) 20 (c) 10 (d) 40
  30. 30.Round 22.17 to one decimal place. =
  31. 31.Which is closest to 599 × 38? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  32. 32.Which is closest to 202 × 70? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  33. 33.Round 25325 to the nearest hundred.
  34. 34.Which is closest to 902 + 398 + 902? (a) 2300 (b) 2200 (c) 2100 (d) 2400
  35. 35.Round 61.74 to one decimal place. =
  36. 36.Round 35.26 to one decimal place. =
  37. 37.Round 33928 to the nearest thousand.
  38. 38.Which is closest to 199 × 89? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  39. 39.Which is closest to 1505 ÷ 29? (a) 25 (b) 50 (c) 500 (d) 100
  40. 40.Which is closest to 897 + 804 + 197? (a) 1800 (b) 2100 (c) 1900 (d) 2000

Answer key

  1. 32000
  2. 14000
  3. 49.3
  4. 34.8
  5. 50290
  6. 12.5
  7. 4000
  8. 77.6
  9. 900
  10. 10410
  11. 27000
  12. 80
  13. 89100
  14. 30
  15. 30
  16. 18000
  17. 27000
  18. 52.6
  19. 900
  20. 26000
  21. 38000
  22. 30
  23. 38000
  24. 50
  25. 45000
  26. 80
  27. 1600
  28. 52.1
  29. 20
  30. 22.2
  31. 24000
  32. 14000
  33. 25300
  34. 2200
  35. 61.7
  36. 35.3
  37. 34000
  38. 18000
  39. 50
  40. 1900

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