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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 149 · 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 2694 ÷ 29? (a) 900 (b) 180 (c) 45 (d) 90
  2. 2.Which is closest to 1492 ÷ 51? (a) 300 (b) 60 (c) 30 (d) 15
  3. 3.Which is closest to 700 + 296 + 600? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  4. 4.Round 39783 to the nearest thousand.
  5. 5.Which is closest to 702 × 89? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  6. 6.Round 21.17 to one decimal place. =
  7. 7.Which is closest to 502 + 803 + 702? (a) 1900 (b) 2200 (c) 2000 (d) 2100
  8. 8.Which is closest to 2092 ÷ 31? (a) 35 (b) 140 (c) 70 (d) 700
  9. 9.Round 63568 to the nearest ten.
  10. 10.Which is closest to 1500 ÷ 29? (a) 50 (b) 100 (c) 25 (d) 500
  11. 11.Which is closest to 502 + 401 + 295? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  12. 12.Which is closest to 1199 ÷ 41? (a) 30 (b) 15 (c) 300 (d) 60
  13. 13.Which is closest to 1792 ÷ 31? (a) 120 (b) 60 (c) 30 (d) 600
  14. 14.Which is closest to 303 × 41? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  15. 15.Round 38.83 to one decimal place. =
  16. 16.Round 64.63 to one decimal place. =
  17. 17.Which is closest to 202 × 58? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  18. 18.Which is closest to 100 + 604 + 702? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  19. 19.Which is closest to 196 + 104 + 103? (a) 600 (b) 400 (c) 500 (d) 300
  20. 20.Round 67.17 to one decimal place. =
  21. 21.Which is closest to 609 ÷ 21? (a) 15 (b) 30 (c) 300 (d) 60
  22. 22.Round 20711 to the nearest thousand.
  23. 23.Round 78933 to the nearest hundred.
  24. 24.Which is closest to 700 + 397 + 697? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  25. 25.Which is closest to 702 + 302 + 801? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  26. 26.Round 72.56 to one decimal place. =
  27. 27.Round 9453 to the nearest ten.
  28. 28.Which is closest to 909 ÷ 29? (a) 60 (b) 30 (c) 300 (d) 15
  29. 29.Which is closest to 1493 ÷ 49? (a) 60 (b) 300 (c) 30 (d) 15
  30. 30.Which is closest to 800 × 19? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  31. 31.Which is closest to 103 + 796 + 896? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  32. 32.Round 12223 to the nearest ten.
  33. 33.Round 98.76 to one decimal place. =
  34. 34.Round 95.93 to one decimal place. =
  35. 35.Which is closest to 1994 ÷ 39? (a) 50 (b) 100 (c) 500 (d) 25
  36. 36.Which is closest to 3605 ÷ 39? (a) 900 (b) 45 (c) 180 (d) 90
  37. 37.Round 26.84 to one decimal place. =
  38. 38.Which is closest to 401 + 195 + 703? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  39. 39.Round 60.77 to one decimal place. =
  40. 40.Which is closest to 897 + 404 + 95? (a) 1400 (b) 1300 (c) 1500 (d) 1600

Answer key

  1. 90
  2. 30
  3. 1600
  4. 40000
  5. 63000
  6. 21.2
  7. 2000
  8. 70
  9. 63570
  10. 50
  11. 1200
  12. 30
  13. 60
  14. 12000
  15. 38.8
  16. 64.6
  17. 12000
  18. 1400
  19. 400
  20. 67.2
  21. 30
  22. 21000
  23. 78900
  24. 1800
  25. 1800
  26. 72.6
  27. 9450
  28. 30
  29. 30
  30. 16000
  31. 1800
  32. 12220
  33. 98.8
  34. 95.9
  35. 50
  36. 90
  37. 26.8
  38. 1300
  39. 60.8
  40. 1400

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