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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 266 · 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 98493 to the nearest ten.
  2. 2.Round 62.73 to one decimal place. =
  3. 3.Which is closest to 699 × 61? (Round each number first.) (a) 420000 (b) 4200 (c) 42000 (d) 84000
  4. 4.Which is closest to 1598 ÷ 41? (a) 400 (b) 20 (c) 40 (d) 80
  5. 5.Which is closest to 101 + 602 + 901? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  6. 6.Which is closest to 401 + 300 + 503? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  7. 7.Which is closest to 697 × 88? (Round each number first.) (a) 63000 (b) 630000 (c) 126000 (d) 6300
  8. 8.Which is closest to 3192 ÷ 39? (a) 800 (b) 40 (c) 80 (d) 160
  9. 9.Which is closest to 2993 ÷ 49? (a) 60 (b) 120 (c) 30 (d) 600
  10. 10.Round 93.42 to one decimal place. =
  11. 11.Which is closest to 1993 ÷ 39? (a) 100 (b) 25 (c) 500 (d) 50
  12. 12.Round 74.28 to one decimal place. =
  13. 13.Round 47002 to the nearest ten.
  14. 14.Round 2844 to the nearest thousand.
  15. 15.Which is closest to 3494 ÷ 49? (a) 140 (b) 700 (c) 35 (d) 70
  16. 16.Which is closest to 504 × 32? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  17. 17.Round 32.34 to one decimal place. =
  18. 18.Which is closest to 900 + 603 + 203? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  19. 19.Which is closest to 596 × 30? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  20. 20.Which is closest to 495 + 799 + 402? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  21. 21.Which is closest to 804 × 68? (Round each number first.) (a) 5600 (b) 56000 (c) 560000 (d) 112000
  22. 22.Which is closest to 105 + 795 + 101? (a) 900 (b) 1200 (c) 1000 (d) 1100
  23. 23.Which is closest to 301 + 203 + 298? (a) 700 (b) 900 (c) 800 (d) 1000
  24. 24.Round 21931 to the nearest ten.
  25. 25.Which is closest to 3600 ÷ 41? (a) 180 (b) 90 (c) 45 (d) 900
  26. 26.Which is closest to 2009 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  27. 27.Round 72.68 to one decimal place. =
  28. 28.Which is closest to 696 × 40? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  29. 29.Which is closest to 901 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30
  30. 30.Which is closest to 296 + 199 + 699? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  31. 31.Which is closest to 399 × 61? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  32. 32.Round 21036 to the nearest hundred.
  33. 33.Round 79.77 to one decimal place. =
  34. 34.Round 30.19 to one decimal place. =
  35. 35.Which is closest to 2492 ÷ 51? (a) 25 (b) 50 (c) 500 (d) 100
  36. 36.Which is closest to 3497 ÷ 49? (a) 140 (b) 35 (c) 700 (d) 70
  37. 37.Which is closest to 1001 ÷ 49? (a) 10 (b) 200 (c) 20 (d) 40
  38. 38.Which is closest to 104 + 502 + 798? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  39. 39.Round 66060 to the nearest hundred.
  40. 40.Which is closest to 595 + 903 + 299? (a) 2000 (b) 1800 (c) 1900 (d) 1700

Answer key

  1. 98490
  2. 62.7
  3. 42000
  4. 40
  5. 1600
  6. 1200
  7. 63000
  8. 80
  9. 60
  10. 93.4
  11. 50
  12. 74.3
  13. 47000
  14. 3000
  15. 70
  16. 15000
  17. 32.3
  18. 1700
  19. 18000
  20. 1700
  21. 56000
  22. 1000
  23. 800
  24. 21930
  25. 90
  26. 50
  27. 72.7
  28. 28000
  29. 30
  30. 1200
  31. 24000
  32. 21000
  33. 79.8
  34. 30.2
  35. 50
  36. 70
  37. 20
  38. 1400
  39. 66100
  40. 1800

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