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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 828 · 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 102 + 203 + 403? (a) 900 (b) 600 (c) 700 (d) 800
  2. 2.Round 30.18 to one decimal place. =
  3. 3.Round 16.38 to one decimal place. =
  4. 4.Round 96.76 to one decimal place. =
  5. 5.Round 34552 to the nearest thousand.
  6. 6.Which is closest to 902 + 202 + 797? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  7. 7.Round 31293 to the nearest thousand.
  8. 8.Round 29549 to the nearest ten.
  9. 9.Which is closest to 303 + 900 + 299? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  10. 10.Which is closest to 705 + 199 + 298? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  11. 11.Round 99.58 to one decimal place. =
  12. 12.Round 31146 to the nearest ten.
  13. 13.Which is closest to 2397 ÷ 39? (a) 60 (b) 120 (c) 30 (d) 600
  14. 14.Round 22.66 to one decimal place. =
  15. 15.Which is closest to 596 × 38? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  16. 16.Which is closest to 103 + 103 + 895? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  17. 17.Which is closest to 303 × 69? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  18. 18.Which is closest to 597 ÷ 19? (a) 300 (b) 60 (c) 30 (d) 15
  19. 19.Which is closest to 802 + 102 + 296? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  20. 20.Round 40.94 to one decimal place. =
  21. 21.Round 69.06 to one decimal place. =
  22. 22.Round 94965 to the nearest thousand.
  23. 23.Which is closest to 600 + 100 + 298? (a) 900 (b) 1000 (c) 1200 (d) 1100
  24. 24.Which is closest to 603 + 897 + 403? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  25. 25.Which is closest to 696 + 697 + 799? (a) 2300 (b) 2100 (c) 2400 (d) 2200
  26. 26.Which is closest to 295 + 796 + 701? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  27. 27.Which is closest to 196 + 504 + 198? (a) 1100 (b) 900 (c) 800 (d) 1000
  28. 28.Which is closest to 102 + 896 + 696? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  29. 29.Round 42.26 to one decimal place. =
  30. 30.Which is closest to 1499 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  31. 31.Which is closest to 796 × 22? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  32. 32.Which is closest to 2402 ÷ 39? (a) 600 (b) 60 (c) 30 (d) 120
  33. 33.Round 34087 to the nearest thousand.
  34. 34.Which is closest to 199 × 20? (Round each number first.) (a) 40000 (b) 8000 (c) 4000 (d) 400
  35. 35.Which is closest to 198 × 70? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  36. 36.Round 19.14 to one decimal place. =
  37. 37.Which is closest to 101 + 499 + 402? (a) 1100 (b) 900 (c) 1000 (d) 1200
  38. 38.Which is closest to 204 + 97 + 805? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  39. 39.Which is closest to 801 + 96 + 697? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  40. 40.Which is closest to 399 ÷ 19? (a) 10 (b) 40 (c) 20 (d) 200

Answer key

  1. 700
  2. 30.2
  3. 16.4
  4. 96.8
  5. 35000
  6. 1900
  7. 31000
  8. 29550
  9. 1500
  10. 1200
  11. 99.6
  12. 31150
  13. 60
  14. 22.7
  15. 24000
  16. 1100
  17. 21000
  18. 30
  19. 1200
  20. 40.9
  21. 69.1
  22. 95000
  23. 1000
  24. 1900
  25. 2200
  26. 1800
  27. 900
  28. 1700
  29. 42.3
  30. 30
  31. 16000
  32. 60
  33. 34000
  34. 4000
  35. 14000
  36. 19.1
  37. 1000
  38. 1100
  39. 1600
  40. 20

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