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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 856 · 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 61.46 to one decimal place. =
  2. 2.Which is closest to 799 × 21? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  3. 3.Which is closest to 902 + 699 + 400? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  4. 4.Round 87468 to the nearest ten.
  5. 5.Round 37246 to the nearest thousand.
  6. 6.Round 36702 to the nearest hundred.
  7. 7.Round 35176 to the nearest ten.
  8. 8.Which is closest to 2795 ÷ 39? (a) 140 (b) 700 (c) 35 (d) 70
  9. 9.Round 66788 to the nearest hundred.
  10. 10.Which is closest to 1599 ÷ 39? (a) 80 (b) 40 (c) 400 (d) 20
  11. 11.Which is closest to 705 + 799 + 804? (a) 2200 (b) 2300 (c) 2400 (d) 2500
  12. 12.Round 5067 to the nearest ten.
  13. 13.Which is closest to 103 + 896 + 203? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  14. 14.Which is closest to 900 × 71? (Round each number first.) (a) 63000 (b) 126000 (c) 630000 (d) 6300
  15. 15.Round 4535 to the nearest hundred.
  16. 16.Which is closest to 597 × 32? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  17. 17.Round 60.87 to one decimal place. =
  18. 18.Which is closest to 197 × 58? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  19. 19.Round 12.79 to one decimal place. =
  20. 20.Which is closest to 802 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
  21. 21.Which is closest to 3600 ÷ 41? (a) 900 (b) 180 (c) 45 (d) 90
  22. 22.Round 66.53 to one decimal place. =
  23. 23.Round 7892 to the nearest ten.
  24. 24.Round 48814 to the nearest hundred.
  25. 25.Which is closest to 597 + 305 + 903? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  26. 26.Which is closest to 2693 ÷ 31? (a) 900 (b) 45 (c) 90 (d) 180
  27. 27.Round 18.17 to one decimal place. =
  28. 28.Round 14026 to the nearest ten.
  29. 29.Round 79789 to the nearest hundred.
  30. 30.Round 59.11 to one decimal place. =
  31. 31.Which is closest to 2407 ÷ 39? (a) 600 (b) 120 (c) 30 (d) 60
  32. 32.Round 43324 to the nearest hundred.
  33. 33.Which is closest to 105 + 302 + 595? (a) 1200 (b) 1000 (c) 1100 (d) 900
  34. 34.Which is closest to 897 + 105 + 905? (a) 2100 (b) 2000 (c) 1900 (d) 1800
  35. 35.Round 20.78 to one decimal place. =
  36. 36.Round 35.28 to one decimal place. =
  37. 37.Which is closest to 1198 ÷ 21? (a) 120 (b) 600 (c) 30 (d) 60
  38. 38.Which is closest to 499 × 81? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  39. 39.Which is closest to 104 + 804 + 304? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  40. 40.Which is closest to 598 + 498 + 497? (a) 1700 (b) 1800 (c) 1600 (d) 1500

Answer key

  1. 61.5
  2. 16000
  3. 2000
  4. 87470
  5. 37000
  6. 36700
  7. 35180
  8. 70
  9. 66800
  10. 40
  11. 2300
  12. 5070
  13. 1200
  14. 63000
  15. 4500
  16. 18000
  17. 60.9
  18. 12000
  19. 12.8
  20. 20
  21. 90
  22. 66.5
  23. 7890
  24. 48800
  25. 1800
  26. 90
  27. 18.2
  28. 14030
  29. 79800
  30. 59.1
  31. 60
  32. 43300
  33. 1000
  34. 1900
  35. 20.8
  36. 35.3
  37. 60
  38. 40000
  39. 1200
  40. 1600

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