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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 935 · 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 701 × 28? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  2. 2.Round 97973 to the nearest thousand.
  3. 3.Round 28637 to the nearest thousand.
  4. 4.Which is closest to 95 + 199 + 103? (a) 500 (b) 600 (c) 400 (d) 300
  5. 5.Which is closest to 603 × 39? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  6. 6.Which is closest to 601 × 82? (Round each number first.) (a) 4800 (b) 480000 (c) 96000 (d) 48000
  7. 7.Which is closest to 799 ÷ 41? (a) 10 (b) 40 (c) 200 (d) 20
  8. 8.Which is closest to 1201 ÷ 29? (a) 20 (b) 40 (c) 80 (d) 400
  9. 9.Round 63.61 to one decimal place. =
  10. 10.Which is closest to 1199 ÷ 41? (a) 30 (b) 300 (c) 15 (d) 60
  11. 11.Which is closest to 196 × 89? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  12. 12.Which is closest to 303 × 20? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  13. 13.Which is closest to 397 × 32? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  14. 14.Round 50589 to the nearest ten.
  15. 15.Which is closest to 898 + 199 + 105? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  16. 16.Which is closest to 300 × 18? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  17. 17.Round 49029 to the nearest ten.
  18. 18.Round 70.36 to one decimal place. =
  19. 19.Which is closest to 698 × 62? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  20. 20.Round 4522 to the nearest thousand.
  21. 21.Which is closest to 203 × 71? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  22. 22.Which is closest to 696 + 404 + 603? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  23. 23.Round 69487 to the nearest hundred.
  24. 24.Round 37.52 to one decimal place. =
  25. 25.Round 59.87 to one decimal place. =
  26. 26.Which is closest to 699 × 29? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  27. 27.Round 72078 to the nearest thousand.
  28. 28.Which is closest to 200 × 28? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  29. 29.Which is closest to 805 + 595 + 205? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  30. 30.Round 78.32 to one decimal place. =
  31. 31.Which is closest to 704 × 39? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  32. 32.Which is closest to 1992 ÷ 49? (a) 40 (b) 80 (c) 20 (d) 400
  33. 33.Round 25.46 to one decimal place. =
  34. 34.Which is closest to 296 × 48? (Round each number first.) (a) 15000 (b) 150000 (c) 30000 (d) 1500
  35. 35.Round 63.38 to one decimal place. =
  36. 36.Which is closest to 598 × 39? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  37. 37.Which is closest to 798 + 195 + 804? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  38. 38.Round 75.69 to one decimal place. =
  39. 39.Which is closest to 3494 ÷ 49? (a) 70 (b) 140 (c) 35 (d) 700
  40. 40.Round 10.38 to one decimal place. =

Answer key

  1. 21000
  2. 98000
  3. 29000
  4. 400
  5. 24000
  6. 48000
  7. 20
  8. 40
  9. 63.6
  10. 30
  11. 18000
  12. 6000
  13. 12000
  14. 50590
  15. 1200
  16. 6000
  17. 49030
  18. 70.4
  19. 42000
  20. 5000
  21. 14000
  22. 1700
  23. 69500
  24. 37.5
  25. 59.9
  26. 21000
  27. 72000
  28. 6000
  29. 1600
  30. 78.3
  31. 28000
  32. 40
  33. 25.5
  34. 15000
  35. 63.4
  36. 24000
  37. 1800
  38. 75.7
  39. 70
  40. 10.4

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