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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 853 · 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 15767 to the nearest hundred.
  2. 2.Which is closest to 300 × 48? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  3. 3.Round 34907 to the nearest ten.
  4. 4.Which is closest to 196 × 89? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  5. 5.Which is closest to 699 + 396 + 500? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  6. 6.Round 16.92 to one decimal place. =
  7. 7.Which is closest to 496 + 800 + 500? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  8. 8.Which is closest to 596 + 501 + 797? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  9. 9.Which is closest to 1399 ÷ 19? (a) 35 (b) 700 (c) 140 (d) 70
  10. 10.Which is closest to 2098 ÷ 29? (a) 35 (b) 140 (c) 70 (d) 700
  11. 11.Which is closest to 603 ÷ 19? (a) 30 (b) 300 (c) 15 (d) 60
  12. 12.Which is closest to 897 × 91? (Round each number first.) (a) 81000 (b) 8100 (c) 162000 (d) 810000
  13. 13.Which is closest to 105 + 900 + 598? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  14. 14.Which is closest to 2394 ÷ 41? (a) 60 (b) 600 (c) 120 (d) 30
  15. 15.Which is closest to 202 + 796 + 201? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  16. 16.Round 21.19 to one decimal place. =
  17. 17.Which is closest to 503 × 71? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  18. 18.Which is closest to 298 × 78? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  19. 19.Round 85827 to the nearest hundred.
  20. 20.Round 44.16 to one decimal place. =
  21. 21.Which is closest to 1200 ÷ 29? (a) 40 (b) 20 (c) 80 (d) 400
  22. 22.Which is closest to 197 + 395 + 597? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  23. 23.Round 34165 to the nearest thousand.
  24. 24.Which is closest to 399 × 92? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  25. 25.Which is closest to 201 × 82? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  26. 26.Which is closest to 396 × 91? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  27. 27.Which is closest to 299 + 802 + 695? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  28. 28.Which is closest to 96 + 205 + 501? (a) 900 (b) 700 (c) 1000 (d) 800
  29. 29.Round 81091 to the nearest hundred.
  30. 30.Round 79.77 to one decimal place. =
  31. 31.Which is closest to 598 × 28? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  32. 32.Which is closest to 1206 ÷ 31? (a) 80 (b) 40 (c) 20 (d) 400
  33. 33.Which is closest to 597 × 69? (Round each number first.) (a) 420000 (b) 42000 (c) 84000 (d) 4200
  34. 34.Round 32.37 to one decimal place. =
  35. 35.Round 15.69 to one decimal place. =
  36. 36.Round 32543 to the nearest thousand.
  37. 37.Round 81.33 to one decimal place. =
  38. 38.Which is closest to 1007 ÷ 19? (a) 25 (b) 100 (c) 500 (d) 50
  39. 39.Which is closest to 599 × 90? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
  40. 40.Which is closest to 398 × 48? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000

Answer key

  1. 15800
  2. 15000
  3. 34910
  4. 18000
  5. 1600
  6. 16.9
  7. 1800
  8. 1900
  9. 70
  10. 70
  11. 30
  12. 81000
  13. 1600
  14. 60
  15. 1200
  16. 21.2
  17. 35000
  18. 24000
  19. 85800
  20. 44.2
  21. 40
  22. 1200
  23. 34000
  24. 36000
  25. 16000
  26. 36000
  27. 1800
  28. 800
  29. 81100
  30. 79.8
  31. 18000
  32. 40
  33. 42000
  34. 32.4
  35. 15.7
  36. 33000
  37. 81.3
  38. 50
  39. 54000
  40. 20000

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