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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 362 · 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 1205 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  2. 2.Which is closest to 297 × 32? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  3. 3.Round 64.17 to one decimal place. =
  4. 4.Which is closest to 201 + 297 + 800? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  5. 5.Round 47.18 to one decimal place. =
  6. 6.Round 14.73 to one decimal place. =
  7. 7.Which is closest to 398 + 797 + 904? (a) 2100 (b) 2000 (c) 2300 (d) 2200
  8. 8.Which is closest to 196 × 30? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  9. 9.Which is closest to 1200 ÷ 39? (a) 15 (b) 30 (c) 60 (d) 300
  10. 10.Round 20567 to the nearest ten.
  11. 11.Which is closest to 801 + 195 + 500? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  12. 12.Which is closest to 1509 ÷ 49? (a) 60 (b) 300 (c) 15 (d) 30
  13. 13.Which is closest to 604 × 71? (Round each number first.) (a) 420000 (b) 84000 (c) 42000 (d) 4200
  14. 14.Round 5774 to the nearest ten.
  15. 15.Which is closest to 796 + 900 + 896? (a) 2700 (b) 2600 (c) 2500 (d) 2800
  16. 16.Round 69.94 to one decimal place. =
  17. 17.Round 37947 to the nearest thousand.
  18. 18.Which is closest to 302 × 70? (Round each number first.) (a) 210000 (b) 21000 (c) 42000 (d) 2100
  19. 19.Which is closest to 302 + 496 + 502? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  20. 20.Which is closest to 199 × 61? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  21. 21.Round 25.74 to one decimal place. =
  22. 22.Which is closest to 201 × 61? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  23. 23.Round 99.21 to one decimal place. =
  24. 24.Which is closest to 503 × 59? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
  25. 25.Which is closest to 199 × 91? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  26. 26.Round 56365 to the nearest thousand.
  27. 27.Round 49.48 to one decimal place. =
  28. 28.Which is closest to 899 + 302 + 97? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  29. 29.Which is closest to 397 + 197 + 698? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  30. 30.Which is closest to 1599 ÷ 41? (a) 40 (b) 20 (c) 80 (d) 400
  31. 31.Which is closest to 2797 ÷ 41? (a) 70 (b) 700 (c) 35 (d) 140
  32. 32.Which is closest to 599 + 502 + 598? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  33. 33.Which is closest to 402 × 60? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  34. 34.Which is closest to 903 + 802 + 496? (a) 2100 (b) 2400 (c) 2200 (d) 2300
  35. 35.Round 33.72 to one decimal place. =
  36. 36.Which is closest to 204 × 31? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  37. 37.Round 18126 to the nearest hundred.
  38. 38.Round 91892 to the nearest thousand.
  39. 39.Which is closest to 900 + 204 + 104? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  40. 40.Which is closest to 897 × 38? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000

Answer key

  1. 60
  2. 9000
  3. 64.2
  4. 1300
  5. 47.2
  6. 14.7
  7. 2100
  8. 6000
  9. 30
  10. 20570
  11. 1500
  12. 30
  13. 42000
  14. 5770
  15. 2600
  16. 69.9
  17. 38000
  18. 21000
  19. 1300
  20. 12000
  21. 25.7
  22. 12000
  23. 99.2
  24. 30000
  25. 18000
  26. 56000
  27. 49.5
  28. 1300
  29. 1300
  30. 40
  31. 70
  32. 1700
  33. 24000
  34. 2200
  35. 33.7
  36. 6000
  37. 18100
  38. 92000
  39. 1200
  40. 36000

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