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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 534 · 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.Round 93.13 to one decimal place. =
  2. 2.Round 83.52 to one decimal place. =
  3. 3.Which is closest to 197 × 48? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  4. 4.Which is closest to 3508 ÷ 49? (a) 700 (b) 70 (c) 35 (d) 140
  5. 5.Which is closest to 801 × 39? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  6. 6.Which is closest to 397 + 95 + 304? (a) 700 (b) 800 (c) 1000 (d) 900
  7. 7.Which is closest to 896 × 81? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  8. 8.Which is closest to 599 × 39? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  9. 9.Round 34.12 to one decimal place. =
  10. 10.Which is closest to 704 + 296 + 99? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  11. 11.Which is closest to 397 ÷ 21? (a) 200 (b) 10 (c) 40 (d) 20
  12. 12.Which is closest to 600 ÷ 21? (a) 60 (b) 300 (c) 30 (d) 15
  13. 13.Round 66.59 to one decimal place. =
  14. 14.Which is closest to 95 + 600 + 297? (a) 1200 (b) 900 (c) 1100 (d) 1000
  15. 15.Which is closest to 901 × 69? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  16. 16.Which is closest to 201 × 21? (Round each number first.) (a) 4000 (b) 8000 (c) 40000 (d) 400
  17. 17.Round 35.21 to one decimal place. =
  18. 18.Which is closest to 1800 ÷ 31? (a) 120 (b) 600 (c) 30 (d) 60
  19. 19.Round 65296 to the nearest ten.
  20. 20.Which is closest to 395 + 405 + 496? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  21. 21.Which is closest to 204 + 295 + 898? (a) 1400 (b) 1500 (c) 1600 (d) 1300
  22. 22.Round 33.08 to one decimal place. =
  23. 23.Round 46.68 to one decimal place. =
  24. 24.Round 4836 to the nearest hundred.
  25. 25.Round 26.09 to one decimal place. =
  26. 26.Which is closest to 301 × 19? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  27. 27.Round 28113 to the nearest ten.
  28. 28.Round 16.54 to one decimal place. =
  29. 29.Round 2522 to the nearest thousand.
  30. 30.Which is closest to 96 + 201 + 595? (a) 1000 (b) 800 (c) 900 (d) 1100
  31. 31.Which is closest to 393 ÷ 19? (a) 40 (b) 20 (c) 200 (d) 10
  32. 32.Round 62979 to the nearest hundred.
  33. 33.Which is closest to 197 + 604 + 904? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  34. 34.Round 13030 to the nearest thousand.
  35. 35.Round 7095 to the nearest hundred.
  36. 36.Which is closest to 4507 ÷ 49? (a) 45 (b) 900 (c) 90 (d) 180
  37. 37.Which is closest to 197 × 52? (Round each number first.) (a) 10000 (b) 100000 (c) 1000 (d) 20000
  38. 38.Round 15.69 to one decimal place. =
  39. 39.Which is closest to 597 + 696 + 298? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  40. 40.Which is closest to 201 + 796 + 295? (a) 1400 (b) 1300 (c) 1500 (d) 1200

Answer key

  1. 93.1
  2. 83.5
  3. 10000
  4. 70
  5. 32000
  6. 800
  7. 72000
  8. 24000
  9. 34.1
  10. 1100
  11. 20
  12. 30
  13. 66.6
  14. 1000
  15. 63000
  16. 4000
  17. 35.2
  18. 60
  19. 65300
  20. 1300
  21. 1400
  22. 33.1
  23. 46.7
  24. 4800
  25. 26.1
  26. 6000
  27. 28110
  28. 16.5
  29. 3000
  30. 900
  31. 20
  32. 63000
  33. 1700
  34. 13000
  35. 7100
  36. 90
  37. 10000
  38. 15.7
  39. 1600
  40. 1300

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