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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 404 · 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 198 + 200 + 897? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  2. 2.Which is closest to 501 + 803 + 103? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  3. 3.Round 22.11 to one decimal place. =
  4. 4.Which is closest to 1399 ÷ 21? (a) 140 (b) 35 (c) 70 (d) 700
  5. 5.Which is closest to 799 + 404 + 903? (a) 2000 (b) 2100 (c) 2200 (d) 2300
  6. 6.Round 36.28 to one decimal place. =
  7. 7.Round 87685 to the nearest thousand.
  8. 8.Which is closest to 696 + 600 + 203? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  9. 9.Which is closest to 606 ÷ 19? (a) 300 (b) 30 (c) 15 (d) 60
  10. 10.Round 24.16 to one decimal place. =
  11. 11.Which is closest to 800 × 92? (Round each number first.) (a) 720000 (b) 144000 (c) 7200 (d) 72000
  12. 12.Which is closest to 597 + 502 + 803? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  13. 13.Which is closest to 4496 ÷ 51? (a) 90 (b) 900 (c) 180 (d) 45
  14. 14.Which is closest to 303 + 495 + 501? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  15. 15.Which is closest to 2994 ÷ 51? (a) 30 (b) 600 (c) 60 (d) 120
  16. 16.Which is closest to 1495 ÷ 51? (a) 30 (b) 60 (c) 300 (d) 15
  17. 17.Which is closest to 403 + 599 + 399? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  18. 18.Which is closest to 2408 ÷ 31? (a) 40 (b) 800 (c) 160 (d) 80
  19. 19.Round 79.79 to one decimal place. =
  20. 20.Round 38347 to the nearest ten.
  21. 21.Which is closest to 2398 ÷ 29? (a) 40 (b) 160 (c) 800 (d) 80
  22. 22.Which is closest to 196 × 48? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  23. 23.Round 23712 to the nearest hundred.
  24. 24.Round 65.94 to one decimal place. =
  25. 25.Round 82972 to the nearest thousand.
  26. 26.Round 43.78 to one decimal place. =
  27. 27.Which is closest to 100 + 395 + 96? (a) 600 (b) 500 (c) 700 (d) 800
  28. 28.Round 21.08 to one decimal place. =
  29. 29.Round 23897 to the nearest thousand.
  30. 30.Which is closest to 500 × 39? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  31. 31.Round 3653 to the nearest thousand.
  32. 32.Which is closest to 302 × 19? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  33. 33.Which is closest to 601 × 21? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  34. 34.Round 70508 to the nearest thousand.
  35. 35.Round 89.17 to one decimal place. =
  36. 36.Which is closest to 2396 ÷ 31? (a) 160 (b) 40 (c) 800 (d) 80
  37. 37.Round 34.58 to one decimal place. =
  38. 38.Which is closest to 897 × 28? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  39. 39.Round 13923 to the nearest hundred.
  40. 40.Which is closest to 801 × 42? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000

Answer key

  1. 1300
  2. 1400
  3. 22.1
  4. 70
  5. 2100
  6. 36.3
  7. 88000
  8. 1500
  9. 30
  10. 24.2
  11. 72000
  12. 1900
  13. 90
  14. 1300
  15. 60
  16. 30
  17. 1400
  18. 80
  19. 79.8
  20. 38350
  21. 80
  22. 10000
  23. 23700
  24. 65.9
  25. 83000
  26. 43.8
  27. 600
  28. 21.1
  29. 24000
  30. 20000
  31. 4000
  32. 6000
  33. 12000
  34. 71000
  35. 89.2
  36. 80
  37. 34.6
  38. 27000
  39. 13900
  40. 32000

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