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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 618 · 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 604 × 39? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  2. 2.Which is closest to 396 × 30? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  3. 3.Round 57291 to the nearest thousand.
  4. 4.Which is closest to 400 + 301 + 200? (a) 1000 (b) 1100 (c) 800 (d) 900
  5. 5.Which is closest to 299 × 79? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  6. 6.Round 43.51 to one decimal place. =
  7. 7.Round 91.21 to one decimal place. =
  8. 8.Round 79.82 to one decimal place. =
  9. 9.Which is closest to 401 × 19? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  10. 10.Which is closest to 3604 ÷ 41? (a) 900 (b) 180 (c) 45 (d) 90
  11. 11.Which is closest to 400 × 89? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  12. 12.Round 35.11 to one decimal place. =
  13. 13.Which is closest to 702 × 29? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  14. 14.Which is closest to 301 × 89? (Round each number first.) (a) 27000 (b) 270000 (c) 2700 (d) 54000
  15. 15.Which is closest to 802 × 78? (Round each number first.) (a) 128000 (b) 640000 (c) 64000 (d) 6400
  16. 16.Which is closest to 405 + 300 + 896? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  17. 17.Which is closest to 596 + 702 + 495? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  18. 18.Which is closest to 894 ÷ 29? (a) 15 (b) 30 (c) 60 (d) 300
  19. 19.Which is closest to 2106 ÷ 31? (a) 140 (b) 35 (c) 700 (d) 70
  20. 20.Round 94.53 to one decimal place. =
  21. 21.Round 68149 to the nearest ten.
  22. 22.Which is closest to 496 × 60? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  23. 23.Which is closest to 200 + 298 + 101? (a) 700 (b) 600 (c) 800 (d) 500
  24. 24.Which is closest to 901 × 68? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
  25. 25.Which is closest to 399 × 38? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  26. 26.Round 14523 to the nearest thousand.
  27. 27.Round 61.36 to one decimal place. =
  28. 28.Which is closest to 405 + 302 + 797? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  29. 29.Round 16.59 to one decimal place. =
  30. 30.Round 54772 to the nearest ten.
  31. 31.Which is closest to 1000 ÷ 51? (a) 40 (b) 20 (c) 200 (d) 10
  32. 32.Which is closest to 896 + 497 + 295? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  33. 33.Round 99556 to the nearest thousand.
  34. 34.Round 22400 to the nearest thousand.
  35. 35.Which is closest to 1992 ÷ 49? (a) 400 (b) 80 (c) 20 (d) 40
  36. 36.Which is closest to 1999 ÷ 49? (a) 40 (b) 20 (c) 400 (d) 80
  37. 37.Round 10561 to the nearest ten.
  38. 38.Round 81.57 to one decimal place. =
  39. 39.Round 32.33 to one decimal place. =
  40. 40.Round 13151 to the nearest hundred.

Answer key

  1. 24000
  2. 12000
  3. 57000
  4. 900
  5. 24000
  6. 43.5
  7. 91.2
  8. 79.8
  9. 8000
  10. 90
  11. 36000
  12. 35.1
  13. 21000
  14. 27000
  15. 64000
  16. 1600
  17. 1800
  18. 30
  19. 70
  20. 94.5
  21. 68150
  22. 30000
  23. 600
  24. 63000
  25. 16000
  26. 15000
  27. 61.4
  28. 1500
  29. 16.6
  30. 54770
  31. 20
  32. 1700
  33. 100000
  34. 22000
  35. 40
  36. 40
  37. 10560
  38. 81.6
  39. 32.3
  40. 13200

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