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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 302 · 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 803 × 29? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  2. 2.Which is closest to 605 + 296 + 699? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  3. 3.Which is closest to 402 + 204 + 598? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  4. 4.Round 63.48 to one decimal place. =
  5. 5.Which is closest to 2796 ÷ 39? (a) 140 (b) 700 (c) 70 (d) 35
  6. 6.Round 15003 to the nearest hundred.
  7. 7.Which is closest to 100 + 702 + 496? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  8. 8.Which is closest to 804 + 295 + 203? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  9. 9.Which is closest to 1599 ÷ 39? (a) 40 (b) 80 (c) 400 (d) 20
  10. 10.Which is closest to 696 × 28? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  11. 11.Round 22954 to the nearest ten.
  12. 12.Which is closest to 897 + 605 + 704? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  13. 13.Round 20.44 to one decimal place. =
  14. 14.Round 57.06 to one decimal place. =
  15. 15.Round 10301 to the nearest hundred.
  16. 16.Round 58.08 to one decimal place. =
  17. 17.Round 19.88 to one decimal place. =
  18. 18.Which is closest to 496 × 92? (Round each number first.) (a) 45000 (b) 90000 (c) 4500 (d) 450000
  19. 19.Which is closest to 1195 ÷ 41? (a) 60 (b) 30 (c) 300 (d) 15
  20. 20.Round 87.09 to one decimal place. =
  21. 21.Round 12109 to the nearest hundred.
  22. 22.Which is closest to 1004 ÷ 49? (a) 10 (b) 200 (c) 20 (d) 40
  23. 23.Which is closest to 800 × 79? (Round each number first.) (a) 64000 (b) 640000 (c) 6400 (d) 128000
  24. 24.Round 97952 to the nearest thousand.
  25. 25.Round 30525 to the nearest hundred.
  26. 26.Which is closest to 899 + 97 + 300? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  27. 27.Which is closest to 1409 ÷ 19? (a) 35 (b) 70 (c) 140 (d) 700
  28. 28.Which is closest to 203 × 79? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  29. 29.Which is closest to 602 × 58? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  30. 30.Which is closest to 399 × 28? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  31. 31.Round 89.76 to one decimal place. =
  32. 32.Which is closest to 102 + 97 + 402? (a) 800 (b) 700 (c) 600 (d) 500
  33. 33.Which is closest to 602 × 88? (Round each number first.) (a) 54000 (b) 5400 (c) 108000 (d) 540000
  34. 34.Which is closest to 1603 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  35. 35.Round 73.64 to one decimal place. =
  36. 36.Round 63117 to the nearest ten.
  37. 37.Which is closest to 1201 ÷ 19? (a) 600 (b) 30 (c) 120 (d) 60
  38. 38.Which is closest to 704 × 88? (Round each number first.) (a) 6300 (b) 630000 (c) 126000 (d) 63000
  39. 39.Which is closest to 297 + 803 + 497? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  40. 40.Which is closest to 798 × 51? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000

Answer key

  1. 24000
  2. 1600
  3. 1200
  4. 63.5
  5. 70
  6. 15000
  7. 1300
  8. 1300
  9. 40
  10. 21000
  11. 22950
  12. 2200
  13. 20.4
  14. 57.1
  15. 10300
  16. 58.1
  17. 19.9
  18. 45000
  19. 30
  20. 87.1
  21. 12100
  22. 20
  23. 64000
  24. 98000
  25. 30500
  26. 1300
  27. 70
  28. 16000
  29. 36000
  30. 12000
  31. 89.8
  32. 600
  33. 54000
  34. 80
  35. 73.6
  36. 63120
  37. 60
  38. 63000
  39. 1600
  40. 40000

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