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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 136 · 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 703 + 197 + 604? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  2. 2.Round 93196 to the nearest ten.
  3. 3.Round 7312 to the nearest hundred.
  4. 4.Which is closest to 303 × 91? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  5. 5.Which is closest to 499 × 58? (Round each number first.) (a) 300000 (b) 30000 (c) 3000 (d) 60000
  6. 6.Round 64922 to the nearest thousand.
  7. 7.Which is closest to 904 + 800 + 504? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  8. 8.Which is closest to 2700 ÷ 29? (a) 180 (b) 90 (c) 45 (d) 900
  9. 9.Round 33.44 to one decimal place. =
  10. 10.Which is closest to 399 + 104 + 195? (a) 700 (b) 600 (c) 900 (d) 800
  11. 11.Which is closest to 204 + 100 + 300? (a) 600 (b) 500 (c) 700 (d) 800
  12. 12.Which is closest to 798 + 101 + 202? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  13. 13.Round 64257 to the nearest ten.
  14. 14.Round 50.16 to one decimal place. =
  15. 15.Round 46.46 to one decimal place. =
  16. 16.Which is closest to 2693 ÷ 29? (a) 900 (b) 180 (c) 45 (d) 90
  17. 17.Round 49448 to the nearest thousand.
  18. 18.Round 25.81 to one decimal place. =
  19. 19.Round 75.17 to one decimal place. =
  20. 20.Which is closest to 994 ÷ 19? (a) 100 (b) 50 (c) 500 (d) 25
  21. 21.Which is closest to 303 × 29? (Round each number first.) (a) 9000 (b) 900 (c) 18000 (d) 90000
  22. 22.Round 64479 to the nearest thousand.
  23. 23.Round 86884 to the nearest ten.
  24. 24.Round 24459 to the nearest ten.
  25. 25.Which is closest to 404 × 70? (Round each number first.) (a) 56000 (b) 280000 (c) 2800 (d) 28000
  26. 26.Round 72658 to the nearest ten.
  27. 27.Which is closest to 497 + 795 + 203? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  28. 28.Which is closest to 902 + 100 + 105? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  29. 29.Round 13277 to the nearest hundred.
  30. 30.Which is closest to 698 × 60? (Round each number first.) (a) 42000 (b) 4200 (c) 84000 (d) 420000
  31. 31.Round 5366 to the nearest ten.
  32. 32.Which is closest to 1005 ÷ 49? (a) 40 (b) 200 (c) 10 (d) 20
  33. 33.Which is closest to 404 + 696 + 103? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  34. 34.Which is closest to 199 × 19? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  35. 35.Round 74.62 to one decimal place. =
  36. 36.Round 17448 to the nearest ten.
  37. 37.Round 87.21 to one decimal place. =
  38. 38.Which is closest to 1607 ÷ 21? (a) 800 (b) 40 (c) 160 (d) 80
  39. 39.Which is closest to 405 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  40. 40.Which is closest to 3209 ÷ 41? (a) 80 (b) 40 (c) 160 (d) 800

Answer key

  1. 1500
  2. 93200
  3. 7300
  4. 27000
  5. 30000
  6. 65000
  7. 2200
  8. 90
  9. 33.4
  10. 700
  11. 600
  12. 1100
  13. 64260
  14. 50.2
  15. 46.5
  16. 90
  17. 49000
  18. 25.8
  19. 75.2
  20. 50
  21. 9000
  22. 64000
  23. 86880
  24. 24460
  25. 28000
  26. 72660
  27. 1500
  28. 1100
  29. 13300
  30. 42000
  31. 5370
  32. 20
  33. 1200
  34. 4000
  35. 74.6
  36. 17450
  37. 87.2
  38. 80
  39. 20
  40. 80

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