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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 44 · 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 302 × 20? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
  2. 2.Round 75504 to the nearest hundred.
  3. 3.Which is closest to 601 × 82? (Round each number first.) (a) 96000 (b) 480000 (c) 48000 (d) 4800
  4. 4.Round 28.42 to one decimal place. =
  5. 5.Round 82647 to the nearest hundred.
  6. 6.Which is closest to 2495 ÷ 51? (a) 100 (b) 500 (c) 25 (d) 50
  7. 7.Round 49.19 to one decimal place. =
  8. 8.Round 94.92 to one decimal place. =
  9. 9.Which is closest to 1195 ÷ 29? (a) 80 (b) 400 (c) 20 (d) 40
  10. 10.Round 29.84 to one decimal place. =
  11. 11.Round 80069 to the nearest ten.
  12. 12.Which is closest to 199 × 92? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  13. 13.Which is closest to 2399 ÷ 29? (a) 800 (b) 80 (c) 40 (d) 160
  14. 14.Which is closest to 807 ÷ 39? (a) 200 (b) 40 (c) 10 (d) 20
  15. 15.Which is closest to 600 × 79? (Round each number first.) (a) 96000 (b) 4800 (c) 48000 (d) 480000
  16. 16.Which is closest to 903 + 202 + 599? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  17. 17.Round 28670 to the nearest thousand.
  18. 18.Round 52709 to the nearest hundred.
  19. 19.Which is closest to 1592 ÷ 41? (a) 80 (b) 400 (c) 40 (d) 20
  20. 20.Round 5290 to the nearest hundred.
  21. 21.Which is closest to 2493 ÷ 49? (a) 500 (b) 25 (c) 50 (d) 100
  22. 22.Which is closest to 702 × 31? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000
  23. 23.Which is closest to 102 + 795 + 398? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  24. 24.Round 99167 to the nearest thousand.
  25. 25.Which is closest to 204 × 38? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  26. 26.Which is closest to 796 ÷ 19? (a) 80 (b) 40 (c) 20 (d) 400
  27. 27.Round 71132 to the nearest thousand.
  28. 28.Round 23.79 to one decimal place. =
  29. 29.Which is closest to 196 × 29? (Round each number first.) (a) 6000 (b) 12000 (c) 60000 (d) 600
  30. 30.Round 9975 to the nearest thousand.
  31. 31.Which is closest to 898 × 50? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  32. 32.Which is closest to 1995 ÷ 51? (a) 20 (b) 400 (c) 40 (d) 80
  33. 33.Which is closest to 597 + 303 + 298? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  34. 34.Round 93.14 to one decimal place. =
  35. 35.Which is closest to 698 × 79? (Round each number first.) (a) 560000 (b) 5600 (c) 56000 (d) 112000
  36. 36.Round 40.18 to one decimal place. =
  37. 37.Round 80.49 to one decimal place. =
  38. 38.Round 24955 to the nearest thousand.
  39. 39.Which is closest to 297 + 303 + 103? (a) 600 (b) 800 (c) 900 (d) 700
  40. 40.Round 61.46 to one decimal place. =

Answer key

  1. 6000
  2. 75500
  3. 48000
  4. 28.4
  5. 82600
  6. 50
  7. 49.2
  8. 94.9
  9. 40
  10. 29.8
  11. 80070
  12. 18000
  13. 80
  14. 20
  15. 48000
  16. 1700
  17. 29000
  18. 52700
  19. 40
  20. 5300
  21. 50
  22. 21000
  23. 1300
  24. 99000
  25. 8000
  26. 40
  27. 71000
  28. 23.8
  29. 6000
  30. 10000
  31. 45000
  32. 40
  33. 1200
  34. 93.1
  35. 56000
  36. 40.2
  37. 80.5
  38. 25000
  39. 700
  40. 61.5

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