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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 278 · 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 2804 ÷ 39? (a) 140 (b) 700 (c) 70 (d) 35
  2. 2.Round 44200 to the nearest thousand.
  3. 3.Which is closest to 2802 ÷ 41? (a) 700 (b) 35 (c) 140 (d) 70
  4. 4.Round 67.31 to one decimal place. =
  5. 5.Round 12.22 to one decimal place. =
  6. 6.Round 20940 to the nearest thousand.
  7. 7.Which is closest to 202 + 195 + 505? (a) 900 (b) 1000 (c) 800 (d) 1100
  8. 8.Which is closest to 299 × 88? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  9. 9.Which is closest to 1505 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  10. 10.Round 23194 to the nearest hundred.
  11. 11.Which is closest to 198 × 21? (Round each number first.) (a) 400 (b) 4000 (c) 8000 (d) 40000
  12. 12.Round 81.76 to one decimal place. =
  13. 13.Which is closest to 101 + 103 + 500? (a) 600 (b) 700 (c) 900 (d) 800
  14. 14.Round 89015 to the nearest thousand.
  15. 15.Round 27472 to the nearest thousand.
  16. 16.Which is closest to 1009 ÷ 51? (a) 20 (b) 200 (c) 40 (d) 10
  17. 17.Which is closest to 4503 ÷ 49? (a) 180 (b) 900 (c) 45 (d) 90
  18. 18.Which is closest to 1000 ÷ 21? (a) 500 (b) 50 (c) 25 (d) 100
  19. 19.Which is closest to 495 + 795 + 804? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  20. 20.Round 29940 to the nearest thousand.
  21. 21.Round 24.64 to one decimal place. =
  22. 22.Which is closest to 200 + 95 + 496? (a) 1000 (b) 700 (c) 900 (d) 800
  23. 23.Which is closest to 791 ÷ 19? (a) 400 (b) 20 (c) 40 (d) 80
  24. 24.Round 44.91 to one decimal place. =
  25. 25.Which is closest to 1598 ÷ 19? (a) 40 (b) 80 (c) 160 (d) 800
  26. 26.Which is closest to 599 + 104 + 905? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  27. 27.Round 30.61 to one decimal place. =
  28. 28.Which is closest to 902 + 700 + 96? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  29. 29.Round 82134 to the nearest hundred.
  30. 30.Which is closest to 3196 ÷ 39? (a) 160 (b) 80 (c) 800 (d) 40
  31. 31.Round 98530 to the nearest thousand.
  32. 32.Round 42.72 to one decimal place. =
  33. 33.Round 96615 to the nearest thousand.
  34. 34.Which is closest to 299 + 897 + 196? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  35. 35.Which is closest to 901 × 81? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  36. 36.Which is closest to 197 × 89? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  37. 37.Round 59879 to the nearest thousand.
  38. 38.Round 39.46 to one decimal place. =
  39. 39.Which is closest to 503 + 805 + 498? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  40. 40.Which is closest to 298 × 71? (Round each number first.) (a) 42000 (b) 2100 (c) 210000 (d) 21000

Answer key

  1. 70
  2. 44000
  3. 70
  4. 67.3
  5. 12.2
  6. 21000
  7. 900
  8. 27000
  9. 30
  10. 23200
  11. 4000
  12. 81.8
  13. 700
  14. 89000
  15. 27000
  16. 20
  17. 90
  18. 50
  19. 2100
  20. 30000
  21. 24.6
  22. 800
  23. 40
  24. 44.9
  25. 80
  26. 1600
  27. 30.6
  28. 1700
  29. 82100
  30. 80
  31. 99000
  32. 42.7
  33. 97000
  34. 1400
  35. 72000
  36. 18000
  37. 60000
  38. 39.5
  39. 1800
  40. 21000

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