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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 456 · 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 2801 ÷ 39? (a) 140 (b) 700 (c) 35 (d) 70
  2. 2.Which is closest to 1495 ÷ 51? (a) 30 (b) 60 (c) 300 (d) 15
  3. 3.Round 71307 to the nearest thousand.
  4. 4.Round 28.71 to one decimal place. =
  5. 5.Round 79.19 to one decimal place. =
  6. 6.Which is closest to 905 + 795 + 96? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  7. 7.Round 93598 to the nearest thousand.
  8. 8.Which is closest to 101 + 99 + 699? (a) 1000 (b) 1100 (c) 800 (d) 900
  9. 9.Which is closest to 397 × 38? (Round each number first.) (a) 16000 (b) 32000 (c) 1600 (d) 160000
  10. 10.Which is closest to 95 + 896 + 202? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  11. 11.Round 13.51 to one decimal place. =
  12. 12.Which is closest to 205 + 197 + 503? (a) 900 (b) 1000 (c) 800 (d) 1100
  13. 13.Which is closest to 403 ÷ 21? (a) 20 (b) 200 (c) 40 (d) 10
  14. 14.Which is closest to 404 × 42? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  15. 15.Which is closest to 897 × 72? (Round each number first.) (a) 630000 (b) 126000 (c) 63000 (d) 6300
  16. 16.Round 75203 to the nearest ten.
  17. 17.Round 60.13 to one decimal place. =
  18. 18.Which is closest to 296 + 205 + 497? (a) 1200 (b) 1000 (c) 1100 (d) 900
  19. 19.Which is closest to 295 + 298 + 496? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  20. 20.Which is closest to 401 × 91? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  21. 21.Which is closest to 203 + 897 + 500? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  22. 22.Round 30.72 to one decimal place. =
  23. 23.Which is closest to 901 + 701 + 205? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  24. 24.Which is closest to 1406 ÷ 19? (a) 700 (b) 70 (c) 140 (d) 35
  25. 25.Round 15163 to the nearest ten.
  26. 26.Which is closest to 505 + 100 + 195? (a) 700 (b) 800 (c) 1000 (d) 900
  27. 27.Which is closest to 602 + 596 + 400? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  28. 28.Which is closest to 1200 ÷ 31? (a) 400 (b) 40 (c) 80 (d) 20
  29. 29.Round 68019 to the nearest hundred.
  30. 30.Which is closest to 605 + 298 + 399? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  31. 31.Which is closest to 502 × 40? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  32. 32.Which is closest to 96 + 695 + 901? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  33. 33.Which is closest to 504 × 68? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  34. 34.Round 28937 to the nearest hundred.
  35. 35.Which is closest to 197 + 103 + 400? (a) 800 (b) 900 (c) 700 (d) 600
  36. 36.Which is closest to 3204 ÷ 39? (a) 160 (b) 80 (c) 40 (d) 800
  37. 37.Which is closest to 803 × 48? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  38. 38.Which is closest to 398 × 69? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  39. 39.Round 39774 to the nearest hundred.
  40. 40.Round 9066 to the nearest thousand.

Answer key

  1. 70
  2. 30
  3. 71000
  4. 28.7
  5. 79.2
  6. 1800
  7. 94000
  8. 900
  9. 16000
  10. 1200
  11. 13.5
  12. 900
  13. 20
  14. 16000
  15. 63000
  16. 75200
  17. 60.1
  18. 1000
  19. 1100
  20. 36000
  21. 1600
  22. 30.7
  23. 1800
  24. 70
  25. 15160
  26. 800
  27. 1600
  28. 40
  29. 68000
  30. 1300
  31. 20000
  32. 1700
  33. 35000
  34. 28900
  35. 700
  36. 80
  37. 40000
  38. 28000
  39. 39800
  40. 9000

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