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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 830 · 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 1208 ÷ 19? (a) 120 (b) 600 (c) 60 (d) 30
  2. 2.Round 91.19 to one decimal place. =
  3. 3.Which is closest to 298 × 69? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  4. 4.Which is closest to 994 ÷ 51? (a) 200 (b) 20 (c) 40 (d) 10
  5. 5.Round 45.12 to one decimal place. =
  6. 6.Which is closest to 203 + 899 + 199? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  7. 7.Round 30.32 to one decimal place. =
  8. 8.Which is closest to 902 × 49? (Round each number first.) (a) 45000 (b) 450000 (c) 90000 (d) 4500
  9. 9.Which is closest to 3503 ÷ 51? (a) 35 (b) 140 (c) 700 (d) 70
  10. 10.Round 81.17 to one decimal place. =
  11. 11.Which is closest to 1007 ÷ 51? (a) 40 (b) 10 (c) 20 (d) 200
  12. 12.Which is closest to 599 × 38? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  13. 13.Which is closest to 898 + 298 + 99? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  14. 14.Which is closest to 997 ÷ 19? (a) 100 (b) 50 (c) 500 (d) 25
  15. 15.Which is closest to 204 × 51? (Round each number first.) (a) 1000 (b) 100000 (c) 20000 (d) 10000
  16. 16.Round 32909 to the nearest thousand.
  17. 17.Which is closest to 904 × 19? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  18. 18.Which is closest to 300 + 502 + 500? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  19. 19.Round 81219 to the nearest hundred.
  20. 20.Round 9967 to the nearest ten.
  21. 21.Which is closest to 296 + 102 + 497? (a) 1000 (b) 900 (c) 800 (d) 1100
  22. 22.Which is closest to 1798 ÷ 19? (a) 45 (b) 900 (c) 90 (d) 180
  23. 23.Which is closest to 198 × 22? (Round each number first.) (a) 40000 (b) 8000 (c) 4000 (d) 400
  24. 24.Round 46848 to the nearest thousand.
  25. 25.Round 41.72 to one decimal place. =
  26. 26.Which is closest to 95 + 400 + 699? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  27. 27.Which is closest to 3203 ÷ 41? (a) 160 (b) 800 (c) 40 (d) 80
  28. 28.Round 75092 to the nearest ten.
  29. 29.Which is closest to 1204 ÷ 29? (a) 80 (b) 400 (c) 40 (d) 20
  30. 30.Round 81.47 to one decimal place. =
  31. 31.Which is closest to 501 × 61? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  32. 32.Round 69848 to the nearest ten.
  33. 33.Round 95.68 to one decimal place. =
  34. 34.Round 12.69 to one decimal place. =
  35. 35.Round 64.76 to one decimal place. =
  36. 36.Round 66.87 to one decimal place. =
  37. 37.Round 26.56 to one decimal place. =
  38. 38.Round 43.07 to one decimal place. =
  39. 39.Which is closest to 597 × 61? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  40. 40.Which is closest to 698 × 78? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000

Answer key

  1. 60
  2. 91.2
  3. 21000
  4. 20
  5. 45.1
  6. 1300
  7. 30.3
  8. 45000
  9. 70
  10. 81.2
  11. 20
  12. 24000
  13. 1300
  14. 50
  15. 10000
  16. 33000
  17. 18000
  18. 1300
  19. 81200
  20. 9970
  21. 900
  22. 90
  23. 4000
  24. 47000
  25. 41.7
  26. 1200
  27. 80
  28. 75090
  29. 40
  30. 81.5
  31. 30000
  32. 69850
  33. 95.7
  34. 12.7
  35. 64.8
  36. 66.9
  37. 26.6
  38. 43.1
  39. 36000
  40. 56000

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