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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 187 · 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 599 × 42? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  2. 2.Round 34074 to the nearest thousand.
  3. 3.Round 11.94 to one decimal place. =
  4. 4.Round 19499 to the nearest hundred.
  5. 5.Which is closest to 301 + 297 + 195? (a) 900 (b) 700 (c) 1000 (d) 800
  6. 6.Round 59.64 to one decimal place. =
  7. 7.Round 33.22 to one decimal place. =
  8. 8.Which is closest to 905 + 95 + 395? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  9. 9.Round 33.36 to one decimal place. =
  10. 10.Round 68340 to the nearest thousand.
  11. 11.Round 55.53 to one decimal place. =
  12. 12.Round 93.53 to one decimal place. =
  13. 13.Which is closest to 698 × 82? (Round each number first.) (a) 5600 (b) 56000 (c) 560000 (d) 112000
  14. 14.Which is closest to 1005 ÷ 21? (a) 50 (b) 100 (c) 25 (d) 500
  15. 15.Round 6487 to the nearest ten.
  16. 16.Which is closest to 1193 ÷ 41? (a) 300 (b) 60 (c) 30 (d) 15
  17. 17.Round 89878 to the nearest hundred.
  18. 18.Which is closest to 901 × 92? (Round each number first.) (a) 8100 (b) 81000 (c) 810000 (d) 162000
  19. 19.Which is closest to 699 × 29? (Round each number first.) (a) 21000 (b) 42000 (c) 2100 (d) 210000
  20. 20.Round 62180 to the nearest hundred.
  21. 21.Which is closest to 504 × 29? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
  22. 22.Which is closest to 2392 ÷ 41? (a) 120 (b) 600 (c) 30 (d) 60
  23. 23.Which is closest to 1592 ÷ 19? (a) 80 (b) 40 (c) 160 (d) 800
  24. 24.Which is closest to 1394 ÷ 21? (a) 140 (b) 35 (c) 70 (d) 700
  25. 25.Which is closest to 596 × 88? (Round each number first.) (a) 54000 (b) 5400 (c) 540000 (d) 108000
  26. 26.Round 94538 to the nearest hundred.
  27. 27.Which is closest to 397 × 49? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  28. 28.Which is closest to 205 + 601 + 101? (a) 1100 (b) 800 (c) 1000 (d) 900
  29. 29.Which is closest to 802 × 21? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  30. 30.Round 87920 to the nearest hundred.
  31. 31.Round 30169 to the nearest ten.
  32. 32.Which is closest to 301 × 72? (Round each number first.) (a) 21000 (b) 210000 (c) 42000 (d) 2100
  33. 33.Which is closest to 896 ÷ 31? (a) 15 (b) 60 (c) 30 (d) 300
  34. 34.Round 92.91 to one decimal place. =
  35. 35.Which is closest to 302 × 49? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  36. 36.Which is closest to 403 × 89? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  37. 37.Which is closest to 498 + 704 + 104? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  38. 38.Which is closest to 899 ÷ 29? (a) 60 (b) 30 (c) 15 (d) 300
  39. 39.Which is closest to 603 + 801 + 102? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  40. 40.Which is closest to 296 × 69? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000

Answer key

  1. 24000
  2. 34000
  3. 11.9
  4. 19500
  5. 800
  6. 59.6
  7. 33.2
  8. 1400
  9. 33.4
  10. 68000
  11. 55.5
  12. 93.5
  13. 56000
  14. 50
  15. 6490
  16. 30
  17. 89900
  18. 81000
  19. 21000
  20. 62200
  21. 15000
  22. 60
  23. 80
  24. 70
  25. 54000
  26. 94500
  27. 20000
  28. 900
  29. 16000
  30. 87900
  31. 30170
  32. 21000
  33. 30
  34. 92.9
  35. 15000
  36. 36000
  37. 1300
  38. 30
  39. 1500
  40. 21000

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