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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 350 · 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 401 × 21? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  2. 2.Which is closest to 2100 ÷ 29? (a) 35 (b) 700 (c) 70 (d) 140
  3. 3.Which is closest to 805 + 802 + 100? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  4. 4.Which is closest to 1003 ÷ 51? (a) 200 (b) 10 (c) 40 (d) 20
  5. 5.Which is closest to 196 × 88? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  6. 6.Round 60.73 to one decimal place. =
  7. 7.Which is closest to 698 + 199 + 798? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  8. 8.Round 41.18 to one decimal place. =
  9. 9.Which is closest to 597 × 72? (Round each number first.) (a) 420000 (b) 4200 (c) 42000 (d) 84000
  10. 10.Round 86519 to the nearest thousand.
  11. 11.Round 34110 to the nearest hundred.
  12. 12.Round 79972 to the nearest hundred.
  13. 13.Round 70.51 to one decimal place. =
  14. 14.Which is closest to 298 × 52? (Round each number first.) (a) 30000 (b) 1500 (c) 150000 (d) 15000
  15. 15.Round 83331 to the nearest ten.
  16. 16.Which is closest to 296 + 896 + 605? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  17. 17.Round 22603 to the nearest ten.
  18. 18.Round 57.83 to one decimal place. =
  19. 19.Round 48318 to the nearest thousand.
  20. 20.Round 5679 to the nearest hundred.
  21. 21.Which is closest to 305 + 696 + 898? (a) 2000 (b) 1900 (c) 2100 (d) 1800
  22. 22.Round 17154 to the nearest hundred.
  23. 23.Which is closest to 196 × 32? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  24. 24.Which is closest to 798 + 795 + 195? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  25. 25.Which is closest to 896 × 40? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  26. 26.Which is closest to 900 + 497 + 903? (a) 2300 (b) 2400 (c) 2200 (d) 2500
  27. 27.Which is closest to 202 + 698 + 501? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  28. 28.Round 14028 to the nearest thousand.
  29. 29.Which is closest to 602 + 400 + 97? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  30. 30.Which is closest to 100 + 699 + 696? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  31. 31.Which is closest to 396 × 22? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  32. 32.Round 28.51 to one decimal place. =
  33. 33.Round 88.89 to one decimal place. =
  34. 34.Round 53.51 to one decimal place. =
  35. 35.Which is closest to 1493 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300
  36. 36.Which is closest to 198 × 78? (Round each number first.) (a) 16000 (b) 32000 (c) 1600 (d) 160000
  37. 37.Which is closest to 898 ÷ 29? (a) 30 (b) 300 (c) 15 (d) 60
  38. 38.Which is closest to 202 × 18? (Round each number first.) (a) 8000 (b) 4000 (c) 400 (d) 40000
  39. 39.Which is closest to 796 × 91? (Round each number first.) (a) 7200 (b) 72000 (c) 144000 (d) 720000
  40. 40.Round 10.38 to one decimal place. =

Answer key

  1. 8000
  2. 70
  3. 1700
  4. 20
  5. 18000
  6. 60.7
  7. 1700
  8. 41.2
  9. 42000
  10. 87000
  11. 34100
  12. 80000
  13. 70.5
  14. 15000
  15. 83330
  16. 1800
  17. 22600
  18. 57.8
  19. 48000
  20. 5700
  21. 1900
  22. 17200
  23. 6000
  24. 1800
  25. 36000
  26. 2300
  27. 1400
  28. 14000
  29. 1100
  30. 1500
  31. 8000
  32. 28.5
  33. 88.9
  34. 53.5
  35. 30
  36. 16000
  37. 30
  38. 4000
  39. 72000
  40. 10.4

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