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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 993 · 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 198 + 600 + 300? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  2. 2.Which is closest to 304 × 58? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  3. 3.Which is closest to 3191 ÷ 41? (a) 40 (b) 160 (c) 800 (d) 80
  4. 4.Which is closest to 299 + 303 + 297? (a) 1100 (b) 900 (c) 800 (d) 1000
  5. 5.Round 22804 to the nearest hundred.
  6. 6.Round 64.54 to one decimal place. =
  7. 7.Round 12.34 to one decimal place. =
  8. 8.Round 27.32 to one decimal place. =
  9. 9.Round 61088 to the nearest thousand.
  10. 10.Which is closest to 1002 ÷ 19? (a) 500 (b) 50 (c) 100 (d) 25
  11. 11.Round 12872 to the nearest thousand.
  12. 12.Round 51304 to the nearest hundred.
  13. 13.Which is closest to 4492 ÷ 49? (a) 900 (b) 180 (c) 45 (d) 90
  14. 14.Which is closest to 197 + 100 + 897? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  15. 15.Round 71437 to the nearest hundred.
  16. 16.Round 76163 to the nearest thousand.
  17. 17.Round 98.23 to one decimal place. =
  18. 18.Which is closest to 1194 ÷ 41? (a) 60 (b) 15 (c) 30 (d) 300
  19. 19.Which is closest to 398 × 71? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  20. 20.Which is closest to 2504 ÷ 49? (a) 50 (b) 25 (c) 500 (d) 100
  21. 21.Which is closest to 697 × 60? (Round each number first.) (a) 42000 (b) 420000 (c) 84000 (d) 4200
  22. 22.Which is closest to 205 + 595 + 596? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  23. 23.Which is closest to 198 × 78? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  24. 24.Which is closest to 496 × 59? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  25. 25.Round 52854 to the nearest thousand.
  26. 26.Which is closest to 4504 ÷ 49? (a) 90 (b) 45 (c) 180 (d) 900
  27. 27.Round 55.21 to one decimal place. =
  28. 28.Which is closest to 3607 ÷ 39? (a) 90 (b) 900 (c) 45 (d) 180
  29. 29.Which is closest to 1208 ÷ 21? (a) 60 (b) 120 (c) 600 (d) 30
  30. 30.Which is closest to 2397 ÷ 31? (a) 40 (b) 160 (c) 800 (d) 80
  31. 31.Round 98.28 to one decimal place. =
  32. 32.Which is closest to 199 × 18? (Round each number first.) (a) 400 (b) 8000 (c) 4000 (d) 40000
  33. 33.Which is closest to 598 + 195 + 395? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  34. 34.Which is closest to 396 × 42? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  35. 35.Which is closest to 299 × 39? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  36. 36.Round 46.93 to one decimal place. =
  37. 37.Which is closest to 201 × 29? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  38. 38.Which is closest to 799 × 22? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  39. 39.Which is closest to 803 ÷ 21? (a) 80 (b) 400 (c) 40 (d) 20
  40. 40.Which is closest to 603 × 60? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000

Answer key

  1. 1100
  2. 18000
  3. 80
  4. 900
  5. 22800
  6. 64.5
  7. 12.3
  8. 27.3
  9. 61000
  10. 50
  11. 13000
  12. 51300
  13. 90
  14. 1200
  15. 71400
  16. 76000
  17. 98.2
  18. 30
  19. 28000
  20. 50
  21. 42000
  22. 1400
  23. 16000
  24. 30000
  25. 53000
  26. 90
  27. 55.2
  28. 90
  29. 60
  30. 80
  31. 98.3
  32. 4000
  33. 1200
  34. 16000
  35. 12000
  36. 46.9
  37. 6000
  38. 16000
  39. 40
  40. 36000

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