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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 940 · 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 38.43 to one decimal place. =
  2. 2.Which is closest to 902 + 205 + 796? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  3. 3.Round 41.57 to one decimal place. =
  4. 4.Which is closest to 197 × 59? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  5. 5.Which is closest to 803 × 18? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  6. 6.Round 59056 to the nearest thousand.
  7. 7.Which is closest to 3197 ÷ 39? (a) 40 (b) 800 (c) 80 (d) 160
  8. 8.Which is closest to 3199 ÷ 41? (a) 160 (b) 40 (c) 800 (d) 80
  9. 9.Round 6474 to the nearest ten.
  10. 10.Which is closest to 2395 ÷ 31? (a) 160 (b) 80 (c) 800 (d) 40
  11. 11.Which is closest to 603 × 59? (Round each number first.) (a) 36000 (b) 360000 (c) 3600 (d) 72000
  12. 12.Round 19.76 to one decimal place. =
  13. 13.Which is closest to 2702 ÷ 29? (a) 900 (b) 45 (c) 90 (d) 180
  14. 14.Which is closest to 197 + 297 + 498? (a) 900 (b) 1100 (c) 1000 (d) 1200
  15. 15.Which is closest to 805 + 703 + 100? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  16. 16.Round 33.67 to one decimal place. =
  17. 17.Round 55.59 to one decimal place. =
  18. 18.Which is closest to 105 + 798 + 497? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  19. 19.Round 17.81 to one decimal place. =
  20. 20.Which is closest to 897 × 20? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  21. 21.Which is closest to 3599 ÷ 39? (a) 45 (b) 90 (c) 900 (d) 180
  22. 22.Round 20681 to the nearest thousand.
  23. 23.Round 19.19 to one decimal place. =
  24. 24.Which is closest to 1009 ÷ 19? (a) 25 (b) 500 (c) 50 (d) 100
  25. 25.Round 75.29 to one decimal place. =
  26. 26.Round 11.07 to one decimal place. =
  27. 27.Which is closest to 498 + 203 + 305? (a) 1100 (b) 1200 (c) 900 (d) 1000
  28. 28.Which is closest to 1503 ÷ 51? (a) 60 (b) 15 (c) 300 (d) 30
  29. 29.Round 78007 to the nearest hundred.
  30. 30.Round 34.43 to one decimal place. =
  31. 31.Round 52.88 to one decimal place. =
  32. 32.Which is closest to 1806 ÷ 19? (a) 90 (b) 45 (c) 900 (d) 180
  33. 33.Round 49.68 to one decimal place. =
  34. 34.Which is closest to 605 + 696 + 95? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  35. 35.Which is closest to 597 × 49? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
  36. 36.Which is closest to 401 × 22? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  37. 37.Round 73.41 to one decimal place. =
  38. 38.Which is closest to 899 + 196 + 402? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  39. 39.Round 89.41 to one decimal place. =
  40. 40.Round 13644 to the nearest ten.

Answer key

  1. 38.4
  2. 1900
  3. 41.6
  4. 12000
  5. 16000
  6. 59000
  7. 80
  8. 80
  9. 6470
  10. 80
  11. 36000
  12. 19.8
  13. 90
  14. 1000
  15. 1600
  16. 33.7
  17. 55.6
  18. 1400
  19. 17.8
  20. 18000
  21. 90
  22. 21000
  23. 19.2
  24. 50
  25. 75.3
  26. 11.1
  27. 1000
  28. 30
  29. 78000
  30. 34.4
  31. 52.9
  32. 90
  33. 49.7
  34. 1400
  35. 30000
  36. 8000
  37. 73.4
  38. 1500
  39. 89.4
  40. 13640

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