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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 191 · 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 802 + 900 + 496? (a) 2100 (b) 2400 (c) 2300 (d) 2200
  2. 2.Which is closest to 3599 ÷ 41? (a) 180 (b) 45 (c) 90 (d) 900
  3. 3.Which is closest to 898 × 20? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  4. 4.Round 70309 to the nearest ten.
  5. 5.Which is closest to 302 × 28? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
  6. 6.Which is closest to 596 × 51? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
  7. 7.Round 64348 to the nearest thousand.
  8. 8.Which is closest to 304 + 601 + 403? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  9. 9.Round 42607 to the nearest hundred.
  10. 10.Which is closest to 201 × 29? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  11. 11.Round 26.11 to one decimal place. =
  12. 12.Round 60.66 to one decimal place. =
  13. 13.Which is closest to 900 × 48? (Round each number first.) (a) 90000 (b) 450000 (c) 45000 (d) 4500
  14. 14.Which is closest to 500 × 68? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  15. 15.Which is closest to 1498 ÷ 49? (a) 60 (b) 15 (c) 300 (d) 30
  16. 16.Which is closest to 797 × 68? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  17. 17.Which is closest to 2500 ÷ 49? (a) 500 (b) 100 (c) 25 (d) 50
  18. 18.Round 42703 to the nearest ten.
  19. 19.Round 30.59 to one decimal place. =
  20. 20.Which is closest to 1208 ÷ 31? (a) 80 (b) 20 (c) 400 (d) 40
  21. 21.Which is closest to 102 + 103 + 97? (a) 500 (b) 200 (c) 400 (d) 300
  22. 22.Which is closest to 602 + 300 + 800? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  23. 23.Round 5657 to the nearest ten.
  24. 24.Round 46.21 to one decimal place. =
  25. 25.Which is closest to 597 × 39? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  26. 26.Which is closest to 102 + 595 + 899? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  27. 27.Which is closest to 804 × 50? (Round each number first.) (a) 4000 (b) 80000 (c) 400000 (d) 40000
  28. 28.Which is closest to 792 ÷ 19? (a) 80 (b) 20 (c) 400 (d) 40
  29. 29.Round 62.17 to one decimal place. =
  30. 30.Which is closest to 196 × 51? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
  31. 31.Round 36.67 to one decimal place. =
  32. 32.Which is closest to 3591 ÷ 39? (a) 90 (b) 180 (c) 900 (d) 45
  33. 33.Round 6724 to the nearest ten.
  34. 34.Which is closest to 104 + 98 + 402? (a) 500 (b) 800 (c) 700 (d) 600
  35. 35.Which is closest to 1191 ÷ 31? (a) 80 (b) 20 (c) 400 (d) 40
  36. 36.Which is closest to 804 + 402 + 495? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  37. 37.Which is closest to 599 × 91? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  38. 38.Which is closest to 197 + 104 + 104? (a) 300 (b) 500 (c) 400 (d) 600
  39. 39.Which is closest to 1007 ÷ 49? (a) 10 (b) 20 (c) 40 (d) 200
  40. 40.Which is closest to 902 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30

Answer key

  1. 2200
  2. 90
  3. 18000
  4. 70310
  5. 9000
  6. 30000
  7. 64000
  8. 1300
  9. 42600
  10. 6000
  11. 26.1
  12. 60.7
  13. 45000
  14. 35000
  15. 30
  16. 56000
  17. 50
  18. 42700
  19. 30.6
  20. 40
  21. 300
  22. 1700
  23. 5660
  24. 46.2
  25. 24000
  26. 1600
  27. 40000
  28. 40
  29. 62.2
  30. 10000
  31. 36.7
  32. 90
  33. 6720
  34. 600
  35. 40
  36. 1700
  37. 54000
  38. 400
  39. 20
  40. 30

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