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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 837 · 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 303 × 62? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  2. 2.Which is closest to 599 + 101 + 402? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  3. 3.Round 45391 to the nearest ten.
  4. 4.Which is closest to 396 + 902 + 297? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  5. 5.Which is closest to 305 + 899 + 905? (a) 2200 (b) 2100 (c) 2300 (d) 2000
  6. 6.Which is closest to 3491 ÷ 49? (a) 700 (b) 140 (c) 70 (d) 35
  7. 7.Round 72605 to the nearest thousand.
  8. 8.Round 82779 to the nearest ten.
  9. 9.Which is closest to 100 + 297 + 299? (a) 700 (b) 900 (c) 600 (d) 800
  10. 10.Which is closest to 3505 ÷ 51? (a) 700 (b) 35 (c) 70 (d) 140
  11. 11.Round 86269 to the nearest ten.
  12. 12.Round 21528 to the nearest ten.
  13. 13.Which is closest to 797 + 401 + 98? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  14. 14.Which is closest to 702 + 703 + 505? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  15. 15.Which is closest to 397 × 51? (Round each number first.) (a) 20000 (b) 200000 (c) 40000 (d) 2000
  16. 16.Round 39.39 to one decimal place. =
  17. 17.Which is closest to 100 + 496 + 902? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  18. 18.Which is closest to 991 ÷ 49? (a) 10 (b) 40 (c) 20 (d) 200
  19. 19.Round 48.59 to one decimal place. =
  20. 20.Which is closest to 197 × 69? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  21. 21.Which is closest to 797 × 61? (Round each number first.) (a) 48000 (b) 480000 (c) 96000 (d) 4800
  22. 22.Which is closest to 305 + 597 + 695? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  23. 23.Which is closest to 495 + 695 + 204? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  24. 24.Round 17352 to the nearest thousand.
  25. 25.Which is closest to 897 × 58? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
  26. 26.Which is closest to 2391 ÷ 41? (a) 60 (b) 120 (c) 30 (d) 600
  27. 27.Which is closest to 798 × 68? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  28. 28.Round 44.52 to one decimal place. =
  29. 29.Which is closest to 2806 ÷ 41? (a) 700 (b) 35 (c) 70 (d) 140
  30. 30.Which is closest to 105 + 404 + 299? (a) 1000 (b) 700 (c) 900 (d) 800
  31. 31.Which is closest to 995 ÷ 51? (a) 20 (b) 10 (c) 40 (d) 200
  32. 32.Which is closest to 397 + 802 + 802? (a) 2200 (b) 2000 (c) 2100 (d) 1900
  33. 33.Which is closest to 704 + 703 + 399? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  34. 34.Round 48678 to the nearest hundred.
  35. 35.Which is closest to 102 + 95 + 604? (a) 800 (b) 900 (c) 700 (d) 1000
  36. 36.Which is closest to 101 + 499 + 496? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  37. 37.Round 96032 to the nearest ten.
  38. 38.Which is closest to 796 × 60? (Round each number first.) (a) 4800 (b) 48000 (c) 480000 (d) 96000
  39. 39.Which is closest to 396 + 599 + 105? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  40. 40.Which is closest to 600 + 495 + 203? (a) 1500 (b) 1400 (c) 1300 (d) 1200

Answer key

  1. 18000
  2. 1100
  3. 45390
  4. 1600
  5. 2100
  6. 70
  7. 73000
  8. 82780
  9. 700
  10. 70
  11. 86270
  12. 21530
  13. 1300
  14. 1900
  15. 20000
  16. 39.4
  17. 1500
  18. 20
  19. 48.6
  20. 14000
  21. 48000
  22. 1600
  23. 1400
  24. 17000
  25. 54000
  26. 60
  27. 56000
  28. 44.5
  29. 70
  30. 800
  31. 20
  32. 2000
  33. 1800
  34. 48700
  35. 800
  36. 1100
  37. 96030
  38. 48000
  39. 1100
  40. 1300

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