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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 650 · 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 504 × 38? (Round each number first.) (a) 20000 (b) 2000 (c) 200000 (d) 40000
  2. 2.Which is closest to 299 × 70? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  3. 3.Which is closest to 596 × 80? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  4. 4.Round 68.26 to one decimal place. =
  5. 5.Round 73.14 to one decimal place. =
  6. 6.Which is closest to 1605 ÷ 21? (a) 160 (b) 800 (c) 40 (d) 80
  7. 7.Which is closest to 395 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  8. 8.Which is closest to 300 × 78? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  9. 9.Round 63.46 to one decimal place. =
  10. 10.Which is closest to 896 × 38? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  11. 11.Round 40.46 to one decimal place. =
  12. 12.Which is closest to 698 × 28? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  13. 13.Round 27109 to the nearest thousand.
  14. 14.Which is closest to 697 × 29? (Round each number first.) (a) 210000 (b) 21000 (c) 42000 (d) 2100
  15. 15.Which is closest to 1205 ÷ 39? (a) 30 (b) 15 (c) 60 (d) 300
  16. 16.Round 20.49 to one decimal place. =
  17. 17.Round 12.84 to one decimal place. =
  18. 18.Round 20.27 to one decimal place. =
  19. 19.Which is closest to 397 + 102 + 101? (a) 500 (b) 800 (c) 700 (d) 600
  20. 20.Round 20.89 to one decimal place. =
  21. 21.Which is closest to 802 × 29? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  22. 22.Which is closest to 1992 ÷ 51? (a) 80 (b) 40 (c) 400 (d) 20
  23. 23.Which is closest to 204 × 70? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
  24. 24.Round 94557 to the nearest ten.
  25. 25.Which is closest to 198 × 38? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
  26. 26.Round 49816 to the nearest thousand.
  27. 27.Which is closest to 1792 ÷ 19? (a) 90 (b) 900 (c) 45 (d) 180
  28. 28.Which is closest to 201 + 300 + 204? (a) 900 (b) 700 (c) 600 (d) 800
  29. 29.Which is closest to 800 + 399 + 200? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  30. 30.Which is closest to 899 + 197 + 403? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  31. 31.Which is closest to 2392 ÷ 41? (a) 600 (b) 120 (c) 60 (d) 30
  32. 32.Which is closest to 1593 ÷ 39? (a) 40 (b) 80 (c) 400 (d) 20
  33. 33.Which is closest to 402 + 299 + 195? (a) 800 (b) 1100 (c) 1000 (d) 900
  34. 34.Which is closest to 1597 ÷ 39? (a) 20 (b) 80 (c) 400 (d) 40
  35. 35.Round 59.82 to one decimal place. =
  36. 36.Which is closest to 295 + 296 + 299? (a) 800 (b) 1000 (c) 1100 (d) 900
  37. 37.Round 20161 to the nearest thousand.
  38. 38.Which is closest to 101 + 497 + 497? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  39. 39.Round 12.48 to one decimal place. =
  40. 40.Which is closest to 405 + 197 + 100? (a) 600 (b) 800 (c) 900 (d) 700

Answer key

  1. 20000
  2. 21000
  3. 48000
  4. 68.3
  5. 73.1
  6. 80
  7. 20
  8. 24000
  9. 63.5
  10. 36000
  11. 40.5
  12. 21000
  13. 27000
  14. 21000
  15. 30
  16. 20.5
  17. 12.8
  18. 20.3
  19. 600
  20. 20.9
  21. 24000
  22. 40
  23. 14000
  24. 94560
  25. 8000
  26. 50000
  27. 90
  28. 700
  29. 1400
  30. 1500
  31. 60
  32. 40
  33. 900
  34. 40
  35. 59.8
  36. 900
  37. 20000
  38. 1100
  39. 12.5
  40. 700

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