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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 845 · 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 80097 to the nearest hundred.
  2. 2.Round 83.38 to one decimal place. =
  3. 3.Which is closest to 2497 ÷ 49? (a) 50 (b) 100 (c) 500 (d) 25
  4. 4.Which is closest to 596 ÷ 29? (a) 20 (b) 10 (c) 200 (d) 40
  5. 5.Which is closest to 803 + 905 + 703? (a) 2300 (b) 2500 (c) 2600 (d) 2400
  6. 6.Round 99434 to the nearest ten.
  7. 7.Which is closest to 2998 ÷ 49? (a) 30 (b) 60 (c) 120 (d) 600
  8. 8.Which is closest to 1991 ÷ 49? (a) 40 (b) 20 (c) 80 (d) 400
  9. 9.Which is closest to 403 + 105 + 903? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  10. 10.Which is closest to 197 × 52? (Round each number first.) (a) 1000 (b) 10000 (c) 100000 (d) 20000
  11. 11.Round 28.17 to one decimal place. =
  12. 12.Round 20.31 to one decimal place. =
  13. 13.Which is closest to 3193 ÷ 39? (a) 800 (b) 80 (c) 160 (d) 40
  14. 14.Which is closest to 3507 ÷ 51? (a) 140 (b) 70 (c) 35 (d) 700
  15. 15.Round 4020 to the nearest hundred.
  16. 16.Round 62.61 to one decimal place. =
  17. 17.Round 11.48 to one decimal place. =
  18. 18.Which is closest to 800 + 101 + 899? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  19. 19.Which is closest to 801 × 50? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
  20. 20.Which is closest to 1601 ÷ 39? (a) 80 (b) 40 (c) 400 (d) 20
  21. 21.Which is closest to 1605 ÷ 41? (a) 20 (b) 80 (c) 400 (d) 40
  22. 22.Round 75856 to the nearest ten.
  23. 23.Round 91.36 to one decimal place. =
  24. 24.Round 11.06 to one decimal place. =
  25. 25.Round 67.89 to one decimal place. =
  26. 26.Which is closest to 897 + 697 + 904? (a) 2600 (b) 2700 (c) 2500 (d) 2400
  27. 27.Round 97406 to the nearest thousand.
  28. 28.Round 30.51 to one decimal place. =
  29. 29.Which is closest to 596 × 19? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  30. 30.Which is closest to 603 × 71? (Round each number first.) (a) 420000 (b) 4200 (c) 42000 (d) 84000
  31. 31.Which is closest to 500 + 400 + 797? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  32. 32.Round 69701 to the nearest hundred.
  33. 33.Round 23.64 to one decimal place. =
  34. 34.Which is closest to 991 ÷ 19? (a) 500 (b) 100 (c) 25 (d) 50
  35. 35.Round 58.69 to one decimal place. =
  36. 36.Which is closest to 2505 ÷ 51? (a) 50 (b) 25 (c) 100 (d) 500
  37. 37.Round 99238 to the nearest ten.
  38. 38.Round 96898 to the nearest ten.
  39. 39.Which is closest to 3491 ÷ 49? (a) 140 (b) 700 (c) 35 (d) 70
  40. 40.Which is closest to 2006 ÷ 49? (a) 20 (b) 80 (c) 40 (d) 400

Answer key

  1. 80100
  2. 83.4
  3. 50
  4. 20
  5. 2400
  6. 99430
  7. 60
  8. 40
  9. 1400
  10. 10000
  11. 28.2
  12. 20.3
  13. 80
  14. 70
  15. 4000
  16. 62.6
  17. 11.5
  18. 1800
  19. 40000
  20. 40
  21. 40
  22. 75860
  23. 91.4
  24. 11.1
  25. 67.9
  26. 2500
  27. 97000
  28. 30.5
  29. 12000
  30. 42000
  31. 1700
  32. 69700
  33. 23.6
  34. 50
  35. 58.7
  36. 50
  37. 99240
  38. 96900
  39. 70
  40. 40

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