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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 416 · 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 298 + 305 + 901? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  2. 2.Round 16.39 to one decimal place. =
  3. 3.Which is closest to 2693 ÷ 29? (a) 180 (b) 900 (c) 90 (d) 45
  4. 4.Which is closest to 97 + 298 + 302? (a) 600 (b) 800 (c) 700 (d) 900
  5. 5.Which is closest to 198 × 21? (Round each number first.) (a) 40000 (b) 8000 (c) 400 (d) 4000
  6. 6.Round 18653 to the nearest thousand.
  7. 7.Which is closest to 597 × 48? (Round each number first.) (a) 30000 (b) 3000 (c) 300000 (d) 60000
  8. 8.Which is closest to 197 × 49? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  9. 9.Round 44109 to the nearest thousand.
  10. 10.Which is closest to 596 ÷ 29? (a) 200 (b) 20 (c) 10 (d) 40
  11. 11.Which is closest to 697 × 40? (Round each number first.) (a) 28000 (b) 280000 (c) 56000 (d) 2800
  12. 12.Round 11868 to the nearest thousand.
  13. 13.Round 95482 to the nearest thousand.
  14. 14.Which is closest to 797 + 398 + 597? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  15. 15.Round 72.46 to one decimal place. =
  16. 16.Round 35.17 to one decimal place. =
  17. 17.Which is closest to 500 × 39? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  18. 18.Which is closest to 201 × 58? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  19. 19.Round 15218 to the nearest hundred.
  20. 20.Which is closest to 400 × 92? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  21. 21.Round 21.29 to one decimal place. =
  22. 22.Which is closest to 798 × 18? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  23. 23.Which is closest to 796 × 21? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  24. 24.Which is closest to 502 × 18? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  25. 25.Which is closest to 300 × 91? (Round each number first.) (a) 2700 (b) 270000 (c) 54000 (d) 27000
  26. 26.Which is closest to 504 × 50? (Round each number first.) (a) 250000 (b) 25000 (c) 50000 (d) 2500
  27. 27.Which is closest to 302 + 199 + 897? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  28. 28.Which is closest to 299 + 603 + 399? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  29. 29.Which is closest to 202 × 78? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  30. 30.Round 42347 to the nearest ten.
  31. 31.Which is closest to 796 × 68? (Round each number first.) (a) 560000 (b) 5600 (c) 112000 (d) 56000
  32. 32.Which is closest to 197 × 20? (Round each number first.) (a) 40000 (b) 8000 (c) 4000 (d) 400
  33. 33.Round 55.47 to one decimal place. =
  34. 34.Which is closest to 799 ÷ 41? (a) 40 (b) 10 (c) 20 (d) 200
  35. 35.Which is closest to 797 + 699 + 104? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  36. 36.Round 41.12 to one decimal place. =
  37. 37.Round 79.94 to one decimal place. =
  38. 38.Round 78938 to the nearest ten.
  39. 39.Which is closest to 1504 ÷ 29? (a) 50 (b) 500 (c) 25 (d) 100
  40. 40.Round 37.61 to one decimal place. =

Answer key

  1. 1500
  2. 16.4
  3. 90
  4. 700
  5. 4000
  6. 19000
  7. 30000
  8. 10000
  9. 44000
  10. 20
  11. 28000
  12. 12000
  13. 95000
  14. 1800
  15. 72.5
  16. 35.2
  17. 20000
  18. 12000
  19. 15200
  20. 36000
  21. 21.3
  22. 16000
  23. 16000
  24. 10000
  25. 27000
  26. 25000
  27. 1400
  28. 1300
  29. 16000
  30. 42350
  31. 56000
  32. 4000
  33. 55.5
  34. 20
  35. 1600
  36. 41.1
  37. 79.9
  38. 78940
  39. 50
  40. 37.6

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