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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 515 · 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 901 × 78? (Round each number first.) (a) 720000 (b) 72000 (c) 144000 (d) 7200
  2. 2.Round 79.31 to one decimal place. =
  3. 3.Round 63.58 to one decimal place. =
  4. 4.Round 74096 to the nearest thousand.
  5. 5.Round 17.49 to one decimal place. =
  6. 6.Round 36.19 to one decimal place. =
  7. 7.Which is closest to 1204 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  8. 8.Which is closest to 604 + 904 + 705? (a) 2300 (b) 2400 (c) 2200 (d) 2100
  9. 9.Round 94193 to the nearest ten.
  10. 10.Round 42327 to the nearest ten.
  11. 11.Which is closest to 704 + 596 + 702? (a) 2000 (b) 1900 (c) 2100 (d) 2200
  12. 12.Which is closest to 896 + 496 + 301? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  13. 13.Which is closest to 800 × 61? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  14. 14.Which is closest to 502 + 299 + 300? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  15. 15.Which is closest to 602 ÷ 19? (a) 15 (b) 30 (c) 300 (d) 60
  16. 16.Which is closest to 697 × 20? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  17. 17.Which is closest to 901 × 88? (Round each number first.) (a) 81000 (b) 162000 (c) 810000 (d) 8100
  18. 18.Which is closest to 1596 ÷ 39? (a) 20 (b) 40 (c) 400 (d) 80
  19. 19.Which is closest to 704 + 803 + 299? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  20. 20.Which is closest to 297 × 60? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  21. 21.Which is closest to 400 × 19? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  22. 22.Which is closest to 700 + 201 + 595? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  23. 23.Round 49385 to the nearest hundred.
  24. 24.Which is closest to 199 × 61? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  25. 25.Round 42754 to the nearest thousand.
  26. 26.Which is closest to 399 × 61? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  27. 27.Which is closest to 902 × 68? (Round each number first.) (a) 126000 (b) 630000 (c) 63000 (d) 6300
  28. 28.Round 13.91 to one decimal place. =
  29. 29.Round 95308 to the nearest ten.
  30. 30.Which is closest to 2797 ÷ 39? (a) 35 (b) 700 (c) 140 (d) 70
  31. 31.Which is closest to 300 × 81? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  32. 32.Which is closest to 197 + 704 + 197? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  33. 33.Round 20860 to the nearest thousand.
  34. 34.Round 5191 to the nearest ten.
  35. 35.Round 79.07 to one decimal place. =
  36. 36.Round 58.17 to one decimal place. =
  37. 37.Which is closest to 896 + 800 + 303? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  38. 38.Round 67.66 to one decimal place. =
  39. 39.Which is closest to 1500 ÷ 51? (a) 60 (b) 15 (c) 300 (d) 30
  40. 40.Which is closest to 1496 ÷ 29? (a) 500 (b) 100 (c) 50 (d) 25

Answer key

  1. 72000
  2. 79.3
  3. 63.6
  4. 74000
  5. 17.5
  6. 36.2
  7. 60
  8. 2200
  9. 94190
  10. 42330
  11. 2000
  12. 1700
  13. 48000
  14. 1100
  15. 30
  16. 14000
  17. 81000
  18. 40
  19. 1800
  20. 18000
  21. 8000
  22. 1500
  23. 49400
  24. 12000
  25. 43000
  26. 24000
  27. 63000
  28. 13.9
  29. 95310
  30. 70
  31. 24000
  32. 1100
  33. 21000
  34. 5190
  35. 79.1
  36. 58.2
  37. 2000
  38. 67.7
  39. 30
  40. 50

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