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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 226 · 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 39.59 to one decimal place. =
  2. 2.Which is closest to 298 × 41? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  3. 3.Which is closest to 4007 ÷ 51? (a) 800 (b) 160 (c) 40 (d) 80
  4. 4.Which is closest to 702 + 97 + 899? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  5. 5.Which is closest to 591 ÷ 29? (a) 200 (b) 10 (c) 20 (d) 40
  6. 6.Which is closest to 196 × 79? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  7. 7.Round 36942 to the nearest thousand.
  8. 8.Which is closest to 297 × 62? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  9. 9.Round 42.92 to one decimal place. =
  10. 10.Which is closest to 2391 ÷ 31? (a) 40 (b) 160 (c) 800 (d) 80
  11. 11.Which is closest to 1197 ÷ 39? (a) 300 (b) 15 (c) 30 (d) 60
  12. 12.Which is closest to 704 × 92? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  13. 13.Which is closest to 699 × 39? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  14. 14.Round 58839 to the nearest ten.
  15. 15.Which is closest to 196 + 300 + 403? (a) 1000 (b) 800 (c) 900 (d) 1100
  16. 16.Which is closest to 197 × 91? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  17. 17.Round 39.83 to one decimal place. =
  18. 18.Which is closest to 802 ÷ 39? (a) 40 (b) 20 (c) 200 (d) 10
  19. 19.Round 93395 to the nearest hundred.
  20. 20.Which is closest to 1996 ÷ 41? (a) 50 (b) 25 (c) 100 (d) 500
  21. 21.Round 97878 to the nearest ten.
  22. 22.Round 15.68 to one decimal place. =
  23. 23.Round 30.57 to one decimal place. =
  24. 24.Which is closest to 200 + 795 + 699? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  25. 25.Round 68.46 to one decimal place. =
  26. 26.Round 72904 to the nearest hundred.
  27. 27.Round 21.46 to one decimal place. =
  28. 28.Which is closest to 2005 ÷ 41? (a) 100 (b) 500 (c) 50 (d) 25
  29. 29.Which is closest to 501 + 901 + 498? (a) 1900 (b) 2000 (c) 2100 (d) 1800
  30. 30.Which is closest to 2509 ÷ 51? (a) 100 (b) 500 (c) 50 (d) 25
  31. 31.Which is closest to 199 × 29? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  32. 32.Which is closest to 105 + 504 + 504? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  33. 33.Which is closest to 597 × 39? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  34. 34.Which is closest to 95 + 696 + 497? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  35. 35.Which is closest to 1997 ÷ 49? (a) 400 (b) 80 (c) 40 (d) 20
  36. 36.Which is closest to 804 + 596 + 195? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  37. 37.Round 22.33 to one decimal place. =
  38. 38.Which is closest to 2096 ÷ 31? (a) 70 (b) 700 (c) 140 (d) 35
  39. 39.Which is closest to 2403 ÷ 41? (a) 60 (b) 600 (c) 30 (d) 120
  40. 40.Which is closest to 799 × 31? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000

Answer key

  1. 39.6
  2. 12000
  3. 80
  4. 1700
  5. 20
  6. 16000
  7. 37000
  8. 18000
  9. 42.9
  10. 80
  11. 30
  12. 63000
  13. 28000
  14. 58840
  15. 900
  16. 18000
  17. 39.8
  18. 20
  19. 93400
  20. 50
  21. 97880
  22. 15.7
  23. 30.6
  24. 1700
  25. 68.5
  26. 72900
  27. 21.5
  28. 50
  29. 1900
  30. 50
  31. 6000
  32. 1100
  33. 24000
  34. 1300
  35. 40
  36. 1600
  37. 22.3
  38. 70
  39. 60
  40. 24000

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