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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 207 · 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 1994 ÷ 51? (a) 400 (b) 40 (c) 80 (d) 20
  2. 2.Round 67277 to the nearest hundred.
  3. 3.Which is closest to 796 × 22? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  4. 4.Round 51938 to the nearest ten.
  5. 5.Which is closest to 405 + 397 + 105? (a) 800 (b) 900 (c) 1000 (d) 1100
  6. 6.Which is closest to 3201 ÷ 41? (a) 800 (b) 40 (c) 80 (d) 160
  7. 7.Round 46.36 to one decimal place. =
  8. 8.Which is closest to 1993 ÷ 41? (a) 500 (b) 25 (c) 100 (d) 50
  9. 9.Which is closest to 496 × 38? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  10. 10.Which is closest to 2000 ÷ 39? (a) 500 (b) 50 (c) 25 (d) 100
  11. 11.Round 53.86 to one decimal place. =
  12. 12.Which is closest to 3591 ÷ 39? (a) 90 (b) 900 (c) 180 (d) 45
  13. 13.Round 52516 to the nearest thousand.
  14. 14.Which is closest to 597 × 52? (Round each number first.) (a) 3000 (b) 30000 (c) 60000 (d) 300000
  15. 15.Round 56.51 to one decimal place. =
  16. 16.Which is closest to 1508 ÷ 29? (a) 100 (b) 500 (c) 25 (d) 50
  17. 17.Which is closest to 700 × 18? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  18. 18.Round 49.64 to one decimal place. =
  19. 19.Round 66981 to the nearest ten.
  20. 20.Which is closest to 301 × 79? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  21. 21.Which is closest to 500 × 92? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  22. 22.Which is closest to 3492 ÷ 51? (a) 140 (b) 700 (c) 35 (d) 70
  23. 23.Which is closest to 998 ÷ 19? (a) 500 (b) 25 (c) 100 (d) 50
  24. 24.Which is closest to 1208 ÷ 19? (a) 600 (b) 60 (c) 120 (d) 30
  25. 25.Which is closest to 599 × 31? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  26. 26.Round 3515 to the nearest thousand.
  27. 27.Round 98.93 to one decimal place. =
  28. 28.Which is closest to 298 × 91? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  29. 29.Which is closest to 1602 ÷ 41? (a) 40 (b) 20 (c) 80 (d) 400
  30. 30.Which is closest to 298 × 31? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
  31. 31.Which is closest to 203 × 32? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  32. 32.Round 37.83 to one decimal place. =
  33. 33.Round 85062 to the nearest thousand.
  34. 34.Which is closest to 1595 ÷ 39? (a) 80 (b) 400 (c) 20 (d) 40
  35. 35.Round 14.87 to one decimal place. =
  36. 36.Which is closest to 104 + 196 + 400? (a) 900 (b) 600 (c) 700 (d) 800
  37. 37.Round 20423 to the nearest ten.
  38. 38.Round 83.88 to one decimal place. =
  39. 39.Which is closest to 401 + 305 + 302? (a) 1200 (b) 1100 (c) 1000 (d) 900
  40. 40.Which is closest to 598 × 80? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000

Answer key

  1. 40
  2. 67300
  3. 16000
  4. 51940
  5. 900
  6. 80
  7. 46.4
  8. 50
  9. 20000
  10. 50
  11. 53.9
  12. 90
  13. 53000
  14. 30000
  15. 56.5
  16. 50
  17. 14000
  18. 49.6
  19. 66980
  20. 24000
  21. 45000
  22. 70
  23. 50
  24. 60
  25. 18000
  26. 4000
  27. 98.9
  28. 27000
  29. 40
  30. 9000
  31. 6000
  32. 37.8
  33. 85000
  34. 40
  35. 14.9
  36. 700
  37. 20420
  38. 83.9
  39. 1000
  40. 48000

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