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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 9 · 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 52.91 to one decimal place. =
  2. 2.Round 30.46 to one decimal place. =
  3. 3.Round 65786 to the nearest hundred.
  4. 4.Which is closest to 804 ÷ 19? (a) 20 (b) 400 (c) 40 (d) 80
  5. 5.Which is closest to 1196 ÷ 29? (a) 40 (b) 400 (c) 80 (d) 20
  6. 6.Which is closest to 702 + 799 + 902? (a) 2600 (b) 2500 (c) 2400 (d) 2300
  7. 7.Which is closest to 699 × 22? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  8. 8.Which is closest to 2008 ÷ 49? (a) 400 (b) 20 (c) 40 (d) 80
  9. 9.Which is closest to 398 + 695 + 895? (a) 2000 (b) 2200 (c) 2100 (d) 1900
  10. 10.Round 26.46 to one decimal place. =
  11. 11.Which is closest to 298 + 397 + 902? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  12. 12.Round 80.06 to one decimal place. =
  13. 13.Which is closest to 302 × 58? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  14. 14.Round 25694 to the nearest ten.
  15. 15.Which is closest to 599 + 803 + 98? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  16. 16.Which is closest to 2107 ÷ 31? (a) 140 (b) 35 (c) 700 (d) 70
  17. 17.Round 29710 to the nearest hundred.
  18. 18.Which is closest to 396 × 91? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  19. 19.Which is closest to 898 × 88? (Round each number first.) (a) 162000 (b) 810000 (c) 8100 (d) 81000
  20. 20.Round 91.44 to one decimal place. =
  21. 21.Which is closest to 4497 ÷ 51? (a) 45 (b) 180 (c) 900 (d) 90
  22. 22.Round 39.38 to one decimal place. =
  23. 23.Round 76983 to the nearest thousand.
  24. 24.Which is closest to 203 × 41? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  25. 25.Round 53558 to the nearest thousand.
  26. 26.Round 58983 to the nearest ten.
  27. 27.Round 33.22 to one decimal place. =
  28. 28.Which is closest to 800 ÷ 39? (a) 20 (b) 10 (c) 40 (d) 200
  29. 29.Which is closest to 797 + 700 + 204? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  30. 30.Round 68267 to the nearest hundred.
  31. 31.Which is closest to 702 + 701 + 895? (a) 2200 (b) 2500 (c) 2300 (d) 2400
  32. 32.Which is closest to 3991 ÷ 51? (a) 80 (b) 800 (c) 40 (d) 160
  33. 33.Which is closest to 497 + 303 + 203? (a) 1200 (b) 900 (c) 1000 (d) 1100
  34. 34.Round 61516 to the nearest thousand.
  35. 35.Round 81054 to the nearest thousand.
  36. 36.Round 2087 to the nearest thousand.
  37. 37.Round 12.73 to one decimal place. =
  38. 38.Which is closest to 103 + 302 + 595? (a) 1100 (b) 1200 (c) 1000 (d) 900
  39. 39.Which is closest to 400 × 48? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  40. 40.Round 20125 to the nearest hundred.

Answer key

  1. 52.9
  2. 30.5
  3. 65800
  4. 40
  5. 40
  6. 2400
  7. 14000
  8. 40
  9. 2000
  10. 26.5
  11. 1600
  12. 80.1
  13. 18000
  14. 25690
  15. 1500
  16. 70
  17. 29700
  18. 36000
  19. 81000
  20. 91.4
  21. 90
  22. 39.4
  23. 77000
  24. 8000
  25. 54000
  26. 58980
  27. 33.2
  28. 20
  29. 1700
  30. 68300
  31. 2300
  32. 80
  33. 1000
  34. 62000
  35. 81000
  36. 2000
  37. 12.7
  38. 1000
  39. 20000
  40. 20100

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