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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 147 · 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 45.08 to one decimal place. =
  2. 2.Round 63836 to the nearest ten.
  3. 3.Which is closest to 95 + 303 + 97? (a) 700 (b) 400 (c) 600 (d) 500
  4. 4.Which is closest to 1809 ÷ 19? (a) 45 (b) 180 (c) 900 (d) 90
  5. 5.Round 25732 to the nearest hundred.
  6. 6.Which is closest to 397 × 48? (Round each number first.) (a) 40000 (b) 200000 (c) 20000 (d) 2000
  7. 7.Which is closest to 399 × 40? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  8. 8.Which is closest to 397 × 58? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  9. 9.Round 28920 to the nearest hundred.
  10. 10.Which is closest to 299 + 905 + 301? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  11. 11.Round 82664 to the nearest ten.
  12. 12.Round 90.41 to one decimal place. =
  13. 13.Which is closest to 796 + 202 + 395? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  14. 14.Which is closest to 1192 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
  15. 15.Which is closest to 702 × 58? (Round each number first.) (a) 42000 (b) 420000 (c) 84000 (d) 4200
  16. 16.Which is closest to 202 + 204 + 797? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  17. 17.Which is closest to 198 + 797 + 101? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  18. 18.Round 18.52 to one decimal place. =
  19. 19.Which is closest to 2408 ÷ 29? (a) 160 (b) 80 (c) 800 (d) 40
  20. 20.Which is closest to 101 + 301 + 503? (a) 1000 (b) 800 (c) 1100 (d) 900
  21. 21.Round 72313 to the nearest hundred.
  22. 22.Which is closest to 201 × 38? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  23. 23.Which is closest to 3200 ÷ 41? (a) 80 (b) 800 (c) 160 (d) 40
  24. 24.Round 21.94 to one decimal place. =
  25. 25.Which is closest to 1507 ÷ 51? (a) 60 (b) 300 (c) 15 (d) 30
  26. 26.Which is closest to 1504 ÷ 49? (a) 60 (b) 15 (c) 30 (d) 300
  27. 27.Round 34.41 to one decimal place. =
  28. 28.Round 42579 to the nearest thousand.
  29. 29.Which is closest to 502 × 49? (Round each number first.) (a) 2500 (b) 50000 (c) 25000 (d) 250000
  30. 30.Round 50593 to the nearest ten.
  31. 31.Round 94571 to the nearest thousand.
  32. 32.Which is closest to 1494 ÷ 49? (a) 30 (b) 60 (c) 300 (d) 15
  33. 33.Which is closest to 98 + 895 + 198? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  34. 34.Which is closest to 405 + 600 + 200? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  35. 35.Round 67.08 to one decimal place. =
  36. 36.Round 90.32 to one decimal place. =
  37. 37.Round 98.89 to one decimal place. =
  38. 38.Which is closest to 496 × 41? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
  39. 39.Round 8523 to the nearest ten.
  40. 40.Which is closest to 797 ÷ 39? (a) 200 (b) 10 (c) 20 (d) 40

Answer key

  1. 45.1
  2. 63840
  3. 500
  4. 90
  5. 25700
  6. 20000
  7. 16000
  8. 24000
  9. 28900
  10. 1500
  11. 82660
  12. 90.4
  13. 1400
  14. 40
  15. 42000
  16. 1200
  17. 1100
  18. 18.5
  19. 80
  20. 900
  21. 72300
  22. 8000
  23. 80
  24. 21.9
  25. 30
  26. 30
  27. 34.4
  28. 43000
  29. 25000
  30. 50590
  31. 95000
  32. 30
  33. 1200
  34. 1200
  35. 67.1
  36. 90.3
  37. 98.9
  38. 20000
  39. 8520
  40. 20

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