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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 289 · 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 85.08 to one decimal place. =
  2. 2.Which is closest to 502 × 82? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  3. 3.Which is closest to 4502 ÷ 49? (a) 90 (b) 45 (c) 180 (d) 900
  4. 4.Round 20.67 to one decimal place. =
  5. 5.Which is closest to 603 × 71? (Round each number first.) (a) 420000 (b) 4200 (c) 42000 (d) 84000
  6. 6.Which is closest to 1996 ÷ 39? (a) 100 (b) 50 (c) 25 (d) 500
  7. 7.Which is closest to 295 + 200 + 803? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  8. 8.Which is closest to 502 × 39? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  9. 9.Which is closest to 1803 ÷ 21? (a) 180 (b) 900 (c) 90 (d) 45
  10. 10.Round 23158 to the nearest thousand.
  11. 11.Round 29088 to the nearest hundred.
  12. 12.Which is closest to 1203 ÷ 39? (a) 15 (b) 30 (c) 300 (d) 60
  13. 13.Which is closest to 200 × 92? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  14. 14.Which is closest to 496 × 68? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  15. 15.Round 56.44 to one decimal place. =
  16. 16.Which is closest to 1408 ÷ 19? (a) 70 (b) 35 (c) 140 (d) 700
  17. 17.Which is closest to 1496 ÷ 31? (a) 25 (b) 500 (c) 50 (d) 100
  18. 18.Round 19645 to the nearest thousand.
  19. 19.Which is closest to 597 × 91? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  20. 20.Which is closest to 296 + 96 + 199? (a) 500 (b) 700 (c) 800 (d) 600
  21. 21.Round 16042 to the nearest ten.
  22. 22.Round 31251 to the nearest hundred.
  23. 23.Which is closest to 303 + 799 + 597? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  24. 24.Round 36.88 to one decimal place. =
  25. 25.Which is closest to 302 × 68? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  26. 26.Which is closest to 1606 ÷ 39? (a) 20 (b) 80 (c) 40 (d) 400
  27. 27.Round 13381 to the nearest ten.
  28. 28.Round 30.72 to one decimal place. =
  29. 29.Round 12.69 to one decimal place. =
  30. 30.Which is closest to 396 × 72? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  31. 31.Which is closest to 796 × 30? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  32. 32.Round 61.12 to one decimal place. =
  33. 33.Which is closest to 104 + 98 + 398? (a) 700 (b) 600 (c) 800 (d) 500
  34. 34.Which is closest to 392 ÷ 21? (a) 200 (b) 40 (c) 10 (d) 20
  35. 35.Which is closest to 1505 ÷ 51? (a) 30 (b) 15 (c) 300 (d) 60
  36. 36.Round 24346 to the nearest thousand.
  37. 37.Round 24265 to the nearest thousand.
  38. 38.Which is closest to 595 ÷ 19? (a) 30 (b) 300 (c) 60 (d) 15
  39. 39.Round 99138 to the nearest ten.
  40. 40.Which is closest to 503 × 72? (Round each number first.) (a) 70000 (b) 3500 (c) 350000 (d) 35000

Answer key

  1. 85.1
  2. 40000
  3. 90
  4. 20.7
  5. 42000
  6. 50
  7. 1300
  8. 20000
  9. 90
  10. 23000
  11. 29100
  12. 30
  13. 18000
  14. 35000
  15. 56.4
  16. 70
  17. 50
  18. 20000
  19. 54000
  20. 600
  21. 16040
  22. 31300
  23. 1700
  24. 36.9
  25. 21000
  26. 40
  27. 13380
  28. 30.7
  29. 12.7
  30. 28000
  31. 24000
  32. 61.1
  33. 600
  34. 20
  35. 30
  36. 24000
  37. 24000
  38. 30
  39. 99140
  40. 35000

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