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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 731 · 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 38066 to the nearest ten.
  2. 2.Which is closest to 899 × 20? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  3. 3.Which is closest to 2492 ÷ 49? (a) 50 (b) 100 (c) 25 (d) 500
  4. 4.Round 38.11 to one decimal place. =
  5. 5.Round 12633 to the nearest ten.
  6. 6.Which is closest to 1006 ÷ 49? (a) 200 (b) 40 (c) 20 (d) 10
  7. 7.Which is closest to 1597 ÷ 39? (a) 40 (b) 20 (c) 80 (d) 400
  8. 8.Round 3853 to the nearest ten.
  9. 9.Round 17.22 to one decimal place. =
  10. 10.Which is closest to 1195 ÷ 29? (a) 20 (b) 40 (c) 80 (d) 400
  11. 11.Which is closest to 597 + 200 + 501? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  12. 12.Which is closest to 802 + 404 + 397? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  13. 13.Which is closest to 597 × 81? (Round each number first.) (a) 96000 (b) 4800 (c) 480000 (d) 48000
  14. 14.Round 67.58 to one decimal place. =
  15. 15.Round 52.12 to one decimal place. =
  16. 16.Which is closest to 796 × 38? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  17. 17.Round 35.34 to one decimal place. =
  18. 18.Round 89.47 to one decimal place. =
  19. 19.Which is closest to 497 × 81? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  20. 20.Which is closest to 197 × 78? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  21. 21.Round 51603 to the nearest hundred.
  22. 22.Which is closest to 1593 ÷ 39? (a) 80 (b) 40 (c) 20 (d) 400
  23. 23.Which is closest to 302 + 900 + 197? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  24. 24.Round 74939 to the nearest hundred.
  25. 25.Which is closest to 1191 ÷ 19? (a) 30 (b) 600 (c) 60 (d) 120
  26. 26.Round 45432 to the nearest ten.
  27. 27.Which is closest to 902 × 59? (Round each number first.) (a) 108000 (b) 540000 (c) 54000 (d) 5400
  28. 28.Which is closest to 399 × 91? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  29. 29.Round 7898 to the nearest ten.
  30. 30.Which is closest to 405 + 201 + 195? (a) 900 (b) 800 (c) 700 (d) 1000
  31. 31.Which is closest to 3207 ÷ 41? (a) 160 (b) 800 (c) 80 (d) 40
  32. 32.Round 86.87 to one decimal place. =
  33. 33.Round 69.81 to one decimal place. =
  34. 34.Which is closest to 892 ÷ 31? (a) 15 (b) 300 (c) 60 (d) 30
  35. 35.Which is closest to 697 + 297 + 600? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  36. 36.Which is closest to 1001 ÷ 19? (a) 500 (b) 25 (c) 100 (d) 50
  37. 37.Round 57.53 to one decimal place. =
  38. 38.Round 15876 to the nearest ten.
  39. 39.Round 29.71 to one decimal place. =
  40. 40.Which is closest to 901 × 29? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000

Answer key

  1. 38070
  2. 18000
  3. 50
  4. 38.1
  5. 12630
  6. 20
  7. 40
  8. 3850
  9. 17.2
  10. 40
  11. 1300
  12. 1600
  13. 48000
  14. 67.6
  15. 52.1
  16. 32000
  17. 35.3
  18. 89.5
  19. 40000
  20. 16000
  21. 51600
  22. 40
  23. 1400
  24. 74900
  25. 60
  26. 45430
  27. 54000
  28. 36000
  29. 7900
  30. 800
  31. 80
  32. 86.9
  33. 69.8
  34. 30
  35. 1600
  36. 50
  37. 57.5
  38. 15880
  39. 29.7
  40. 27000

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