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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 137 · 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 1404 ÷ 21? (a) 700 (b) 140 (c) 70 (d) 35
  2. 2.Which is closest to 898 + 900 + 896? (a) 2900 (b) 2600 (c) 2700 (d) 2800
  3. 3.Round 26193 to the nearest ten.
  4. 4.Round 26.77 to one decimal place. =
  5. 5.Round 94.42 to one decimal place. =
  6. 6.Round 83.32 to one decimal place. =
  7. 7.Which is closest to 695 + 801 + 202? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  8. 8.Which is closest to 798 × 92? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  9. 9.Round 69193 to the nearest thousand.
  10. 10.Which is closest to 603 × 28? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  11. 11.Round 53764 to the nearest ten.
  12. 12.Which is closest to 1209 ÷ 41? (a) 30 (b) 60 (c) 300 (d) 15
  13. 13.Round 33065 to the nearest hundred.
  14. 14.Round 15.86 to one decimal place. =
  15. 15.Which is closest to 793 ÷ 41? (a) 200 (b) 10 (c) 20 (d) 40
  16. 16.Round 65.59 to one decimal place. =
  17. 17.Round 71389 to the nearest hundred.
  18. 18.Which is closest to 199 × 21? (Round each number first.) (a) 4000 (b) 8000 (c) 40000 (d) 400
  19. 19.Round 70.59 to one decimal place. =
  20. 20.Which is closest to 401 × 79? (Round each number first.) (a) 3200 (b) 320000 (c) 32000 (d) 64000
  21. 21.Which is closest to 600 ÷ 21? (a) 60 (b) 30 (c) 15 (d) 300
  22. 22.Which is closest to 201 × 79? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  23. 23.Which is closest to 796 × 78? (Round each number first.) (a) 6400 (b) 640000 (c) 64000 (d) 128000
  24. 24.Round 17.79 to one decimal place. =
  25. 25.Round 19.88 to one decimal place. =
  26. 26.Which is closest to 502 + 904 + 405? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  27. 27.Which is closest to 1407 ÷ 19? (a) 700 (b) 35 (c) 70 (d) 140
  28. 28.Which is closest to 992 ÷ 19? (a) 25 (b) 100 (c) 500 (d) 50
  29. 29.Which is closest to 3602 ÷ 39? (a) 180 (b) 45 (c) 90 (d) 900
  30. 30.Which is closest to 299 × 30? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  31. 31.Which is closest to 300 + 305 + 496? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  32. 32.Round 28.12 to one decimal place. =
  33. 33.Which is closest to 899 + 203 + 96? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  34. 34.Round 42575 to the nearest thousand.
  35. 35.Round 81983 to the nearest thousand.
  36. 36.Round 60.23 to one decimal place. =
  37. 37.Which is closest to 696 × 52? (Round each number first.) (a) 3500 (b) 350000 (c) 35000 (d) 70000
  38. 38.Round 13.32 to one decimal place. =
  39. 39.Which is closest to 1193 ÷ 21? (a) 30 (b) 120 (c) 600 (d) 60
  40. 40.Round 35.27 to one decimal place. =

Answer key

  1. 70
  2. 2700
  3. 26190
  4. 26.8
  5. 94.4
  6. 83.3
  7. 1700
  8. 72000
  9. 69000
  10. 18000
  11. 53760
  12. 30
  13. 33100
  14. 15.9
  15. 20
  16. 65.6
  17. 71400
  18. 4000
  19. 70.6
  20. 32000
  21. 30
  22. 16000
  23. 64000
  24. 17.8
  25. 19.9
  26. 1800
  27. 70
  28. 50
  29. 90
  30. 9000
  31. 1100
  32. 28.1
  33. 1200
  34. 43000
  35. 82000
  36. 60.2
  37. 35000
  38. 13.3
  39. 60
  40. 35.3

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