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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 434 · 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 95 + 802 + 303? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  2. 2.Which is closest to 1002 ÷ 51? (a) 10 (b) 200 (c) 40 (d) 20
  3. 3.Which is closest to 601 × 40? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  4. 4.Round 13.77 to one decimal place. =
  5. 5.Round 93.93 to one decimal place. =
  6. 6.Which is closest to 404 + 805 + 495? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  7. 7.Round 92951 to the nearest ten.
  8. 8.Round 76.46 to one decimal place. =
  9. 9.Which is closest to 702 + 301 + 105? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  10. 10.Which is closest to 499 × 48? (Round each number first.) (a) 2500 (b) 50000 (c) 25000 (d) 250000
  11. 11.Which is closest to 1593 ÷ 39? (a) 20 (b) 80 (c) 400 (d) 40
  12. 12.Round 10.31 to one decimal place. =
  13. 13.Round 38.88 to one decimal place. =
  14. 14.Which is closest to 202 + 895 + 101? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  15. 15.Round 58.92 to one decimal place. =
  16. 16.Which is closest to 1008 ÷ 51? (a) 20 (b) 10 (c) 40 (d) 200
  17. 17.Which is closest to 1496 ÷ 51? (a) 300 (b) 15 (c) 60 (d) 30
  18. 18.Which is closest to 593 ÷ 21? (a) 15 (b) 60 (c) 30 (d) 300
  19. 19.Round 60109 to the nearest ten.
  20. 20.Round 79.91 to one decimal place. =
  21. 21.Which is closest to 499 × 39? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  22. 22.Round 39.49 to one decimal place. =
  23. 23.Which is closest to 796 × 32? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  24. 24.Which is closest to 200 × 38? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  25. 25.Round 86.21 to one decimal place. =
  26. 26.Which is closest to 696 + 899 + 304? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  27. 27.Which is closest to 302 + 798 + 296? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  28. 28.Round 12385 to the nearest hundred.
  29. 29.Which is closest to 1000 ÷ 21? (a) 500 (b) 50 (c) 25 (d) 100
  30. 30.Round 85872 to the nearest hundred.
  31. 31.Which is closest to 4006 ÷ 51? (a) 80 (b) 800 (c) 40 (d) 160
  32. 32.Which is closest to 398 × 29? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  33. 33.Which is closest to 701 × 79? (Round each number first.) (a) 560000 (b) 56000 (c) 5600 (d) 112000
  34. 34.Which is closest to 1999 ÷ 49? (a) 400 (b) 40 (c) 20 (d) 80
  35. 35.Which is closest to 401 × 19? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  36. 36.Round 47.16 to one decimal place. =
  37. 37.Which is closest to 1207 ÷ 39? (a) 60 (b) 300 (c) 30 (d) 15
  38. 38.Round 62.18 to one decimal place. =
  39. 39.Which is closest to 795 ÷ 39? (a) 10 (b) 200 (c) 40 (d) 20
  40. 40.Which is closest to 801 ÷ 19? (a) 20 (b) 400 (c) 80 (d) 40

Answer key

  1. 1200
  2. 20
  3. 24000
  4. 13.8
  5. 93.9
  6. 1700
  7. 92950
  8. 76.5
  9. 1100
  10. 25000
  11. 40
  12. 10.3
  13. 38.9
  14. 1200
  15. 58.9
  16. 20
  17. 30
  18. 30
  19. 60110
  20. 79.9
  21. 20000
  22. 39.5
  23. 24000
  24. 8000
  25. 86.2
  26. 1900
  27. 1400
  28. 12400
  29. 50
  30. 85900
  31. 80
  32. 12000
  33. 56000
  34. 40
  35. 8000
  36. 47.2
  37. 30
  38. 62.2
  39. 20
  40. 40

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