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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 157 · 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 1995 ÷ 41? (a) 100 (b) 25 (c) 50 (d) 500
  2. 2.Which is closest to 703 × 50? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  3. 3.Which is closest to 200 × 41? (Round each number first.) (a) 16000 (b) 8000 (c) 800 (d) 80000
  4. 4.Which is closest to 696 × 32? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  5. 5.Which is closest to 1391 ÷ 19? (a) 35 (b) 140 (c) 700 (d) 70
  6. 6.Round 84.33 to one decimal place. =
  7. 7.Which is closest to 596 × 39? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  8. 8.Which is closest to 402 + 395 + 597? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  9. 9.Round 59.76 to one decimal place. =
  10. 10.Round 60.38 to one decimal place. =
  11. 11.Round 41887 to the nearest ten.
  12. 12.Round 73.24 to one decimal place. =
  13. 13.Round 68120 to the nearest thousand.
  14. 14.Round 52619 to the nearest hundred.
  15. 15.Round 91013 to the nearest ten.
  16. 16.Round 8081 to the nearest hundred.
  17. 17.Round 39.26 to one decimal place. =
  18. 18.Round 11.16 to one decimal place. =
  19. 19.Which is closest to 4005 ÷ 51? (a) 40 (b) 80 (c) 160 (d) 800
  20. 20.Which is closest to 200 + 695 + 502? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  21. 21.Which is closest to 395 + 99 + 303? (a) 700 (b) 1000 (c) 900 (d) 800
  22. 22.Which is closest to 101 + 105 + 404? (a) 500 (b) 600 (c) 800 (d) 700
  23. 23.Round 80889 to the nearest ten.
  24. 24.Round 92.59 to one decimal place. =
  25. 25.Round 40928 to the nearest ten.
  26. 26.Which is closest to 401 × 51? (Round each number first.) (a) 2000 (b) 20000 (c) 40000 (d) 200000
  27. 27.Round 45.92 to one decimal place. =
  28. 28.Round 35.27 to one decimal place. =
  29. 29.Which is closest to 595 ÷ 31? (a) 20 (b) 40 (c) 10 (d) 200
  30. 30.Round 97.24 to one decimal place. =
  31. 31.Round 20.09 to one decimal place. =
  32. 32.Which is closest to 797 × 89? (Round each number first.) (a) 720000 (b) 72000 (c) 144000 (d) 7200
  33. 33.Round 44.71 to one decimal place. =
  34. 34.Round 55285 to the nearest hundred.
  35. 35.Round 84001 to the nearest hundred.
  36. 36.Which is closest to 702 × 70? (Round each number first.) (a) 98000 (b) 4900 (c) 490000 (d) 49000
  37. 37.Which is closest to 2397 ÷ 41? (a) 600 (b) 120 (c) 60 (d) 30
  38. 38.Round 32.12 to one decimal place. =
  39. 39.Which is closest to 4496 ÷ 49? (a) 45 (b) 180 (c) 90 (d) 900
  40. 40.Round 21.34 to one decimal place. =

Answer key

  1. 50
  2. 35000
  3. 8000
  4. 21000
  5. 70
  6. 84.3
  7. 24000
  8. 1400
  9. 59.8
  10. 60.4
  11. 41890
  12. 73.2
  13. 68000
  14. 52600
  15. 91010
  16. 8100
  17. 39.3
  18. 11.2
  19. 80
  20. 1400
  21. 800
  22. 600
  23. 80890
  24. 92.6
  25. 40930
  26. 20000
  27. 45.9
  28. 35.3
  29. 20
  30. 97.2
  31. 20.1
  32. 72000
  33. 44.7
  34. 55300
  35. 84000
  36. 49000
  37. 60
  38. 32.1
  39. 90
  40. 21.3

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