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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 523 · 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 397 × 80? (Round each number first.) (a) 64000 (b) 3200 (c) 32000 (d) 320000
  2. 2.Round 12156 to the nearest thousand.
  3. 3.Which is closest to 300 × 41? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  4. 4.Which is closest to 501 × 61? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  5. 5.Which is closest to 897 ÷ 29? (a) 300 (b) 60 (c) 15 (d) 30
  6. 6.Which is closest to 299 × 30? (Round each number first.) (a) 900 (b) 90000 (c) 9000 (d) 18000
  7. 7.Round 69.06 to one decimal place. =
  8. 8.Which is closest to 802 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20
  9. 9.Which is closest to 397 × 20? (Round each number first.) (a) 8000 (b) 80000 (c) 800 (d) 16000
  10. 10.Which is closest to 399 + 500 + 597? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  11. 11.Which is closest to 202 + 700 + 502? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  12. 12.Which is closest to 805 + 904 + 702? (a) 2300 (b) 2400 (c) 2600 (d) 2500
  13. 13.Round 10.74 to one decimal place. =
  14. 14.Which is closest to 198 + 300 + 295? (a) 700 (b) 900 (c) 1000 (d) 800
  15. 15.Which is closest to 96 + 201 + 704? (a) 900 (b) 1200 (c) 1100 (d) 1000
  16. 16.Round 87.47 to one decimal place. =
  17. 17.Which is closest to 2102 ÷ 31? (a) 140 (b) 70 (c) 35 (d) 700
  18. 18.Round 97488 to the nearest ten.
  19. 19.Round 18502 to the nearest ten.
  20. 20.Round 73235 to the nearest hundred.
  21. 21.Which is closest to 402 + 702 + 105? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  22. 22.Which is closest to 699 × 22? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  23. 23.Which is closest to 703 × 29? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  24. 24.Which is closest to 801 + 302 + 96? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  25. 25.Which is closest to 297 × 79? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  26. 26.Which is closest to 807 ÷ 21? (a) 400 (b) 40 (c) 80 (d) 20
  27. 27.Which is closest to 596 × 32? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  28. 28.Which is closest to 3492 ÷ 51? (a) 70 (b) 35 (c) 700 (d) 140
  29. 29.Round 65.63 to one decimal place. =
  30. 30.Round 3605 to the nearest thousand.
  31. 31.Which is closest to 699 × 31? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  32. 32.Which is closest to 500 × 18? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  33. 33.Which is closest to 804 × 60? (Round each number first.) (a) 96000 (b) 4800 (c) 480000 (d) 48000
  34. 34.Which is closest to 99 + 102 + 302? (a) 600 (b) 700 (c) 500 (d) 400
  35. 35.Round 83016 to the nearest ten.
  36. 36.Round 14306 to the nearest hundred.
  37. 37.Round 10.36 to one decimal place. =
  38. 38.Round 91230 to the nearest hundred.
  39. 39.Which is closest to 898 + 102 + 701? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  40. 40.Which is closest to 804 ÷ 21? (a) 20 (b) 40 (c) 400 (d) 80

Answer key

  1. 32000
  2. 12000
  3. 12000
  4. 30000
  5. 30
  6. 9000
  7. 69.1
  8. 40
  9. 8000
  10. 1500
  11. 1400
  12. 2400
  13. 10.7
  14. 800
  15. 1000
  16. 87.5
  17. 70
  18. 97490
  19. 18500
  20. 73200
  21. 1200
  22. 14000
  23. 21000
  24. 1200
  25. 24000
  26. 40
  27. 18000
  28. 70
  29. 65.6
  30. 4000
  31. 21000
  32. 10000
  33. 48000
  34. 500
  35. 83020
  36. 14300
  37. 10.4
  38. 91200
  39. 1700
  40. 40

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