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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 747 · 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 300 + 199 + 201? (a) 900 (b) 800 (c) 600 (d) 700
  2. 2.Round 58406 to the nearest hundred.
  3. 3.Which is closest to 902 × 39? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  4. 4.Round 45870 to the nearest thousand.
  5. 5.Which is closest to 397 × 42? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  6. 6.Round 94.14 to one decimal place. =
  7. 7.Which is closest to 500 + 397 + 905? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  8. 8.Round 28.26 to one decimal place. =
  9. 9.Which is closest to 993 ÷ 51? (a) 200 (b) 10 (c) 20 (d) 40
  10. 10.Round 88665 to the nearest thousand.
  11. 11.Which is closest to 607 ÷ 29? (a) 10 (b) 20 (c) 40 (d) 200
  12. 12.Which is closest to 3200 ÷ 41? (a) 40 (b) 80 (c) 160 (d) 800
  13. 13.Which is closest to 203 + 197 + 799? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  14. 14.Which is closest to 3506 ÷ 49? (a) 70 (b) 700 (c) 140 (d) 35
  15. 15.Which is closest to 297 × 69? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  16. 16.Round 59155 to the nearest hundred.
  17. 17.Which is closest to 300 + 197 + 697? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  18. 18.Which is closest to 1607 ÷ 21? (a) 160 (b) 800 (c) 40 (d) 80
  19. 19.Round 5956 to the nearest hundred.
  20. 20.Which is closest to 802 × 69? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
  21. 21.Which is closest to 804 + 295 + 704? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  22. 22.Which is closest to 105 + 401 + 299? (a) 700 (b) 900 (c) 800 (d) 1000
  23. 23.Which is closest to 1402 ÷ 21? (a) 140 (b) 700 (c) 70 (d) 35
  24. 24.Which is closest to 198 + 502 + 496? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  25. 25.Round 79.06 to one decimal place. =
  26. 26.Round 35.61 to one decimal place. =
  27. 27.Round 96.49 to one decimal place. =
  28. 28.Which is closest to 102 + 497 + 904? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  29. 29.Which is closest to 502 × 79? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
  30. 30.Which is closest to 3606 ÷ 41? (a) 90 (b) 45 (c) 900 (d) 180
  31. 31.Which is closest to 297 × 20? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  32. 32.Which is closest to 1196 ÷ 41? (a) 15 (b) 30 (c) 300 (d) 60
  33. 33.Which is closest to 699 × 59? (Round each number first.) (a) 4200 (b) 420000 (c) 84000 (d) 42000
  34. 34.Which is closest to 4005 ÷ 51? (a) 160 (b) 80 (c) 40 (d) 800
  35. 35.Which is closest to 900 × 18? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  36. 36.Which is closest to 596 × 31? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  37. 37.Which is closest to 796 + 497 + 105? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  38. 38.Which is closest to 397 × 90? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  39. 39.Round 49.21 to one decimal place. =
  40. 40.Round 71.08 to one decimal place. =

Answer key

  1. 700
  2. 58400
  3. 36000
  4. 46000
  5. 16000
  6. 94.1
  7. 1800
  8. 28.3
  9. 20
  10. 89000
  11. 20
  12. 80
  13. 1200
  14. 70
  15. 21000
  16. 59200
  17. 1200
  18. 80
  19. 6000
  20. 56000
  21. 1800
  22. 800
  23. 70
  24. 1200
  25. 79.1
  26. 35.6
  27. 96.5
  28. 1500
  29. 40000
  30. 90
  31. 6000
  32. 30
  33. 42000
  34. 80
  35. 18000
  36. 18000
  37. 1400
  38. 36000
  39. 49.2
  40. 71.1

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