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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 381 · 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.Round 79535 to the nearest thousand.
  2. 2.Round 91.19 to one decimal place. =
  3. 3.Round 40.84 to one decimal place. =
  4. 4.Which is closest to 699 × 31? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  5. 5.Which is closest to 898 + 205 + 201? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  6. 6.Round 11133 to the nearest ten.
  7. 7.Round 47218 to the nearest thousand.
  8. 8.Which is closest to 195 + 703 + 803? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  9. 9.Which is closest to 97 + 497 + 301? (a) 900 (b) 800 (c) 1100 (d) 1000
  10. 10.Which is closest to 603 + 103 + 303? (a) 1100 (b) 1200 (c) 1000 (d) 900
  11. 11.Which is closest to 98 + 205 + 97? (a) 300 (b) 500 (c) 600 (d) 400
  12. 12.Round 79.18 to one decimal place. =
  13. 13.Which is closest to 302 × 60? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  14. 14.Round 78.62 to one decimal place. =
  15. 15.Which is closest to 97 + 403 + 801? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  16. 16.Which is closest to 497 × 29? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  17. 17.Which is closest to 3201 ÷ 41? (a) 800 (b) 80 (c) 160 (d) 40
  18. 18.Round 48.73 to one decimal place. =
  19. 19.Round 71.74 to one decimal place. =
  20. 20.Which is closest to 1196 ÷ 21? (a) 60 (b) 120 (c) 600 (d) 30
  21. 21.Round 53998 to the nearest hundred.
  22. 22.Round 32.36 to one decimal place. =
  23. 23.Which is closest to 699 × 41? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  24. 24.Which is closest to 802 × 19? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  25. 25.Which is closest to 796 ÷ 41? (a) 200 (b) 20 (c) 10 (d) 40
  26. 26.Which is closest to 393 ÷ 21? (a) 200 (b) 40 (c) 10 (d) 20
  27. 27.Which is closest to 399 × 28? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  28. 28.Which is closest to 202 + 801 + 797? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  29. 29.Round 53176 to the nearest hundred.
  30. 30.Round 64.76 to one decimal place. =
  31. 31.Which is closest to 897 ÷ 31? (a) 30 (b) 15 (c) 300 (d) 60
  32. 32.Which is closest to 696 × 48? (Round each number first.) (a) 3500 (b) 70000 (c) 35000 (d) 350000
  33. 33.Which is closest to 3491 ÷ 51? (a) 700 (b) 140 (c) 35 (d) 70
  34. 34.Which is closest to 995 ÷ 49? (a) 20 (b) 40 (c) 10 (d) 200
  35. 35.Round 53320 to the nearest hundred.
  36. 36.Round 45.38 to one decimal place. =
  37. 37.Which is closest to 399 × 80? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  38. 38.Round 76.19 to one decimal place. =
  39. 39.Which is closest to 1392 ÷ 19? (a) 70 (b) 140 (c) 35 (d) 700
  40. 40.Round 22.67 to one decimal place. =

Answer key

  1. 80000
  2. 91.2
  3. 40.8
  4. 21000
  5. 1300
  6. 11130
  7. 47000
  8. 1700
  9. 900
  10. 1000
  11. 400
  12. 79.2
  13. 18000
  14. 78.6
  15. 1300
  16. 15000
  17. 80
  18. 48.7
  19. 71.7
  20. 60
  21. 54000
  22. 32.4
  23. 28000
  24. 16000
  25. 20
  26. 20
  27. 12000
  28. 1800
  29. 53200
  30. 64.8
  31. 30
  32. 35000
  33. 70
  34. 20
  35. 53300
  36. 45.4
  37. 32000
  38. 76.2
  39. 70
  40. 22.7

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