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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 771 · 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 + 595 + 495? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  2. 2.Which is closest to 99 + 295 + 501? (a) 800 (b) 900 (c) 1000 (d) 1100
  3. 3.Round 42.13 to one decimal place. =
  4. 4.Which is closest to 2095 ÷ 31? (a) 70 (b) 35 (c) 700 (d) 140
  5. 5.Which is closest to 1006 ÷ 19? (a) 100 (b) 500 (c) 25 (d) 50
  6. 6.Which is closest to 800 × 92? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  7. 7.Which is closest to 1204 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
  8. 8.Which is closest to 297 × 52? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  9. 9.Which is closest to 1809 ÷ 29? (a) 30 (b) 600 (c) 120 (d) 60
  10. 10.Which is closest to 3605 ÷ 41? (a) 90 (b) 45 (c) 900 (d) 180
  11. 11.Which is closest to 199 + 500 + 695? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  12. 12.Which is closest to 1807 ÷ 21? (a) 900 (b) 180 (c) 45 (d) 90
  13. 13.Which is closest to 305 + 702 + 895? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  14. 14.Which is closest to 299 × 70? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  15. 15.Which is closest to 497 × 18? (Round each number first.) (a) 20000 (b) 10000 (c) 1000 (d) 100000
  16. 16.Which is closest to 401 × 81? (Round each number first.) (a) 32000 (b) 3200 (c) 64000 (d) 320000
  17. 17.Which is closest to 697 + 200 + 96? (a) 900 (b) 1100 (c) 1000 (d) 1200
  18. 18.Round 16.48 to one decimal place. =
  19. 19.Which is closest to 3200 ÷ 39? (a) 800 (b) 80 (c) 160 (d) 40
  20. 20.Which is closest to 803 × 30? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  21. 21.Round 44.64 to one decimal place. =
  22. 22.Round 68.59 to one decimal place. =
  23. 23.Round 47163 to the nearest thousand.
  24. 24.Which is closest to 1198 ÷ 39? (a) 300 (b) 60 (c) 30 (d) 15
  25. 25.Round 69.08 to one decimal place. =
  26. 26.Round 59797 to the nearest ten.
  27. 27.Which is closest to 795 ÷ 21? (a) 400 (b) 20 (c) 40 (d) 80
  28. 28.Which is closest to 896 + 697 + 303? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  29. 29.Round 3331 to the nearest ten.
  30. 30.Round 25576 to the nearest ten.
  31. 31.Round 9493 to the nearest hundred.
  32. 32.Round 19523 to the nearest ten.
  33. 33.Which is closest to 1403 ÷ 19? (a) 140 (b) 35 (c) 700 (d) 70
  34. 34.Which is closest to 1604 ÷ 19? (a) 80 (b) 800 (c) 160 (d) 40
  35. 35.Which is closest to 101 + 399 + 705? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  36. 36.Which is closest to 500 × 42? (Round each number first.) (a) 40000 (b) 2000 (c) 20000 (d) 200000
  37. 37.Round 21.09 to one decimal place. =
  38. 38.Which is closest to 399 × 31? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  39. 39.Round 55.78 to one decimal place. =
  40. 40.Round 90.17 to one decimal place. =

Answer key

  1. 1200
  2. 900
  3. 42.1
  4. 70
  5. 50
  6. 72000
  7. 40
  8. 15000
  9. 60
  10. 90
  11. 1400
  12. 90
  13. 1900
  14. 21000
  15. 10000
  16. 32000
  17. 1000
  18. 16.5
  19. 80
  20. 24000
  21. 44.6
  22. 68.6
  23. 47000
  24. 30
  25. 69.1
  26. 59800
  27. 40
  28. 1900
  29. 3330
  30. 25580
  31. 9500
  32. 19520
  33. 70
  34. 80
  35. 1200
  36. 20000
  37. 21.1
  38. 12000
  39. 55.8
  40. 90.2

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