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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 389 · 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 29262 to the nearest hundred.
  2. 2.Round 58.54 to one decimal place. =
  3. 3.Round 86.59 to one decimal place. =
  4. 4.Round 91.27 to one decimal place. =
  5. 5.Round 87544 to the nearest ten.
  6. 6.Which is closest to 105 + 603 + 400? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  7. 7.Round 74045 to the nearest thousand.
  8. 8.Round 99.73 to one decimal place. =
  9. 9.Which is closest to 604 × 52? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  10. 10.Which is closest to 99 + 195 + 596? (a) 1000 (b) 800 (c) 1100 (d) 900
  11. 11.Which is closest to 795 ÷ 39? (a) 10 (b) 200 (c) 20 (d) 40
  12. 12.Which is closest to 298 × 88? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000
  13. 13.Which is closest to 697 × 59? (Round each number first.) (a) 4200 (b) 42000 (c) 84000 (d) 420000
  14. 14.Which is closest to 300 × 38? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  15. 15.Round 29.49 to one decimal place. =
  16. 16.Round 55.63 to one decimal place. =
  17. 17.Which is closest to 496 × 40? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  18. 18.Round 81207 to the nearest thousand.
  19. 19.Round 68522 to the nearest ten.
  20. 20.Which is closest to 1609 ÷ 21? (a) 800 (b) 80 (c) 160 (d) 40
  21. 21.Round 50.67 to one decimal place. =
  22. 22.Which is closest to 1209 ÷ 31? (a) 80 (b) 20 (c) 40 (d) 400
  23. 23.Round 26377 to the nearest thousand.
  24. 24.Which is closest to 906 ÷ 29? (a) 15 (b) 30 (c) 60 (d) 300
  25. 25.Which is closest to 305 + 500 + 595? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  26. 26.Round 36428 to the nearest ten.
  27. 27.Which is closest to 3209 ÷ 41? (a) 160 (b) 40 (c) 80 (d) 800
  28. 28.Round 38.34 to one decimal place. =
  29. 29.Which is closest to 302 + 303 + 900? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  30. 30.Which is closest to 397 × 29? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  31. 31.Round 60.67 to one decimal place. =
  32. 32.Which is closest to 2405 ÷ 29? (a) 40 (b) 800 (c) 80 (d) 160
  33. 33.Round 25855 to the nearest thousand.
  34. 34.Round 24.51 to one decimal place. =
  35. 35.Which is closest to 995 ÷ 19? (a) 100 (b) 25 (c) 500 (d) 50
  36. 36.Which is closest to 1196 ÷ 41? (a) 30 (b) 300 (c) 15 (d) 60
  37. 37.Round 85.36 to one decimal place. =
  38. 38.Which is closest to 397 × 62? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  39. 39.Round 98.21 to one decimal place. =
  40. 40.Which is closest to 905 + 196 + 301? (a) 1300 (b) 1600 (c) 1500 (d) 1400

Answer key

  1. 29300
  2. 58.5
  3. 86.6
  4. 91.3
  5. 87540
  6. 1100
  7. 74000
  8. 99.7
  9. 30000
  10. 900
  11. 20
  12. 27000
  13. 42000
  14. 12000
  15. 29.5
  16. 55.6
  17. 20000
  18. 81000
  19. 68520
  20. 80
  21. 50.7
  22. 40
  23. 26000
  24. 30
  25. 1400
  26. 36430
  27. 80
  28. 38.3
  29. 1500
  30. 12000
  31. 60.7
  32. 80
  33. 26000
  34. 24.5
  35. 50
  36. 30
  37. 85.4
  38. 24000
  39. 98.2
  40. 1400

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