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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 777 · 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 55.29 to one decimal place. =
  2. 2.Which is closest to 295 + 295 + 198? (a) 900 (b) 1000 (c) 700 (d) 800
  3. 3.Which is closest to 901 × 89? (Round each number first.) (a) 8100 (b) 162000 (c) 810000 (d) 81000
  4. 4.Round 39.66 to one decimal place. =
  5. 5.Which is closest to 596 + 603 + 101? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  6. 6.Which is closest to 204 × 92? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  7. 7.Which is closest to 1993 ÷ 51? (a) 20 (b) 400 (c) 80 (d) 40
  8. 8.Which is closest to 695 + 97 + 696? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  9. 9.Which is closest to 296 × 40? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  10. 10.Which is closest to 402 + 595 + 99? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  11. 11.Which is closest to 400 × 58? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  12. 12.Round 92.18 to one decimal place. =
  13. 13.Round 11058 to the nearest ten.
  14. 14.Which is closest to 96 + 905 + 96? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  15. 15.Which is closest to 1392 ÷ 21? (a) 140 (b) 35 (c) 700 (d) 70
  16. 16.Which is closest to 1601 ÷ 19? (a) 40 (b) 800 (c) 80 (d) 160
  17. 17.Which is closest to 400 × 38? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
  18. 18.Round 56.13 to one decimal place. =
  19. 19.Which is closest to 2092 ÷ 29? (a) 700 (b) 140 (c) 35 (d) 70
  20. 20.Which is closest to 405 + 401 + 104? (a) 1000 (b) 1100 (c) 800 (d) 900
  21. 21.Which is closest to 900 + 696 + 203? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  22. 22.Round 85.72 to one decimal place. =
  23. 23.Round 29786 to the nearest thousand.
  24. 24.Which is closest to 804 ÷ 21? (a) 40 (b) 80 (c) 20 (d) 400
  25. 25.Round 20.86 to one decimal place. =
  26. 26.Which is closest to 202 + 395 + 804? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  27. 27.Which is closest to 794 ÷ 19? (a) 40 (b) 20 (c) 80 (d) 400
  28. 28.Round 68.79 to one decimal place. =
  29. 29.Which is closest to 95 + 800 + 499? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  30. 30.Which is closest to 595 + 196 + 598? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  31. 31.Which is closest to 899 × 32? (Round each number first.) (a) 27000 (b) 270000 (c) 54000 (d) 2700
  32. 32.Round 34.34 to one decimal place. =
  33. 33.Round 78861 to the nearest ten.
  34. 34.Round 11300 to the nearest thousand.
  35. 35.Which is closest to 1191 ÷ 21? (a) 30 (b) 60 (c) 600 (d) 120
  36. 36.Which is closest to 803 × 41? (Round each number first.) (a) 32000 (b) 320000 (c) 64000 (d) 3200
  37. 37.Which is closest to 300 + 705 + 498? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  38. 38.Round 10794 to the nearest ten.
  39. 39.Which is closest to 298 + 204 + 797? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  40. 40.Round 40.71 to one decimal place. =

Answer key

  1. 55.3
  2. 800
  3. 81000
  4. 39.7
  5. 1300
  6. 18000
  7. 40
  8. 1500
  9. 12000
  10. 1100
  11. 24000
  12. 92.2
  13. 11060
  14. 1100
  15. 70
  16. 80
  17. 16000
  18. 56.1
  19. 70
  20. 900
  21. 1800
  22. 85.7
  23. 30000
  24. 40
  25. 20.9
  26. 1400
  27. 40
  28. 68.8
  29. 1400
  30. 1400
  31. 27000
  32. 34.3
  33. 78860
  34. 11000
  35. 60
  36. 32000
  37. 1500
  38. 10790
  39. 1300
  40. 40.7

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