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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 488 · 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 2701 ÷ 29? (a) 180 (b) 45 (c) 90 (d) 900
  2. 2.Round 50627 to the nearest ten.
  3. 3.Which is closest to 991 ÷ 51? (a) 10 (b) 200 (c) 40 (d) 20
  4. 4.Which is closest to 802 ÷ 39? (a) 200 (b) 10 (c) 40 (d) 20
  5. 5.Which is closest to 296 × 19? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  6. 6.Round 67.21 to one decimal place. =
  7. 7.Round 9683 to the nearest ten.
  8. 8.Which is closest to 698 × 69? (Round each number first.) (a) 98000 (b) 490000 (c) 49000 (d) 4900
  9. 9.Round 87337 to the nearest hundred.
  10. 10.Which is closest to 495 + 499 + 302? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  11. 11.Round 52513 to the nearest ten.
  12. 12.Round 38439 to the nearest thousand.
  13. 13.Which is closest to 704 + 303 + 595? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  14. 14.Which is closest to 97 + 298 + 302? (a) 700 (b) 600 (c) 800 (d) 900
  15. 15.Which is closest to 2408 ÷ 41? (a) 600 (b) 60 (c) 30 (d) 120
  16. 16.Which is closest to 597 × 41? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  17. 17.Which is closest to 599 × 91? (Round each number first.) (a) 5400 (b) 108000 (c) 540000 (d) 54000
  18. 18.Which is closest to 498 × 30? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  19. 19.Which is closest to 1195 ÷ 31? (a) 80 (b) 400 (c) 40 (d) 20
  20. 20.Which is closest to 2398 ÷ 31? (a) 80 (b) 160 (c) 40 (d) 800
  21. 21.Which is closest to 898 × 52? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  22. 22.Which is closest to 395 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  23. 23.Which is closest to 303 + 99 + 797? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  24. 24.Which is closest to 302 × 18? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  25. 25.Which is closest to 498 × 18? (Round each number first.) (a) 10000 (b) 1000 (c) 20000 (d) 100000
  26. 26.Round 89.13 to one decimal place. =
  27. 27.Which is closest to 2494 ÷ 51? (a) 500 (b) 25 (c) 50 (d) 100
  28. 28.Round 8187 to the nearest ten.
  29. 29.Which is closest to 400 × 32? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  30. 30.Round 21864 to the nearest ten.
  31. 31.Round 32345 to the nearest thousand.
  32. 32.Which is closest to 499 + 496 + 405? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  33. 33.Which is closest to 997 ÷ 51? (a) 20 (b) 40 (c) 200 (d) 10
  34. 34.Round 7068 to the nearest ten.
  35. 35.Which is closest to 197 + 202 + 401? (a) 1000 (b) 800 (c) 900 (d) 700
  36. 36.Which is closest to 802 + 103 + 398? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  37. 37.Which is closest to 297 + 298 + 897? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  38. 38.Round 50594 to the nearest thousand.
  39. 39.Which is closest to 3591 ÷ 41? (a) 45 (b) 90 (c) 900 (d) 180
  40. 40.Round 4386 to the nearest hundred.

Answer key

  1. 90
  2. 50630
  3. 20
  4. 20
  5. 6000
  6. 67.2
  7. 9680
  8. 49000
  9. 87300
  10. 1300
  11. 52510
  12. 38000
  13. 1600
  14. 700
  15. 60
  16. 24000
  17. 54000
  18. 15000
  19. 40
  20. 80
  21. 45000
  22. 20
  23. 1200
  24. 6000
  25. 10000
  26. 89.1
  27. 50
  28. 8190
  29. 12000
  30. 21860
  31. 32000
  32. 1400
  33. 20
  34. 7070
  35. 800
  36. 1300
  37. 1500
  38. 51000
  39. 90
  40. 4400

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