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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 339 · 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 496 × 78? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  2. 2.Which is closest to 299 + 98 + 103? (a) 400 (b) 600 (c) 700 (d) 500
  3. 3.Which is closest to 3203 ÷ 41? (a) 800 (b) 40 (c) 160 (d) 80
  4. 4.Which is closest to 298 × 39? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  5. 5.Round 69983 to the nearest hundred.
  6. 6.Round 45036 to the nearest hundred.
  7. 7.Which is closest to 602 × 19? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  8. 8.Which is closest to 2002 ÷ 39? (a) 100 (b) 25 (c) 50 (d) 500
  9. 9.Which is closest to 504 × 20? (Round each number first.) (a) 10000 (b) 100000 (c) 1000 (d) 20000
  10. 10.Round 4591 to the nearest ten.
  11. 11.Which is closest to 400 × 22? (Round each number first.) (a) 16000 (b) 8000 (c) 800 (d) 80000
  12. 12.Which is closest to 799 × 51? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
  13. 13.Which is closest to 1494 ÷ 49? (a) 15 (b) 60 (c) 30 (d) 300
  14. 14.Which is closest to 197 × 29? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  15. 15.Round 65344 to the nearest thousand.
  16. 16.Which is closest to 609 ÷ 21? (a) 30 (b) 15 (c) 60 (d) 300
  17. 17.Which is closest to 1195 ÷ 19? (a) 600 (b) 30 (c) 120 (d) 60
  18. 18.Round 78697 to the nearest hundred.
  19. 19.Which is closest to 1200 ÷ 41? (a) 300 (b) 30 (c) 15 (d) 60
  20. 20.Which is closest to 3500 ÷ 49? (a) 140 (b) 70 (c) 700 (d) 35
  21. 21.Which is closest to 3594 ÷ 41? (a) 180 (b) 90 (c) 45 (d) 900
  22. 22.Which is closest to 799 + 395 + 98? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  23. 23.Round 80.79 to one decimal place. =
  24. 24.Which is closest to 2394 ÷ 29? (a) 800 (b) 160 (c) 40 (d) 80
  25. 25.Which is closest to 802 × 90? (Round each number first.) (a) 144000 (b) 7200 (c) 720000 (d) 72000
  26. 26.Round 52.94 to one decimal place. =
  27. 27.Which is closest to 802 + 396 + 599? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  28. 28.Round 80.56 to one decimal place. =
  29. 29.Which is closest to 1209 ÷ 21? (a) 30 (b) 120 (c) 600 (d) 60
  30. 30.Which is closest to 3593 ÷ 41? (a) 180 (b) 900 (c) 90 (d) 45
  31. 31.Which is closest to 2107 ÷ 29? (a) 70 (b) 35 (c) 700 (d) 140
  32. 32.Round 19.79 to one decimal place. =
  33. 33.Round 17.54 to one decimal place. =
  34. 34.Which is closest to 1208 ÷ 31? (a) 20 (b) 400 (c) 80 (d) 40
  35. 35.Which is closest to 702 × 51? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  36. 36.Round 21.81 to one decimal place. =
  37. 37.Round 16.32 to one decimal place. =
  38. 38.Which is closest to 301 + 201 + 396? (a) 800 (b) 1000 (c) 1100 (d) 900
  39. 39.Round 85.43 to one decimal place. =
  40. 40.Which is closest to 1808 ÷ 21? (a) 900 (b) 90 (c) 180 (d) 45

Answer key

  1. 40000
  2. 500
  3. 80
  4. 12000
  5. 70000
  6. 45000
  7. 12000
  8. 50
  9. 10000
  10. 4590
  11. 8000
  12. 40000
  13. 30
  14. 6000
  15. 65000
  16. 30
  17. 60
  18. 78700
  19. 30
  20. 70
  21. 90
  22. 1300
  23. 80.8
  24. 80
  25. 72000
  26. 52.9
  27. 1800
  28. 80.6
  29. 60
  30. 90
  31. 70
  32. 19.8
  33. 17.5
  34. 40
  35. 35000
  36. 21.8
  37. 16.3
  38. 900
  39. 85.4
  40. 90

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