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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 907 · 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 497 + 597 + 502? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  2. 2.Round 27571 to the nearest ten.
  3. 3.Which is closest to 2005 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  4. 4.Round 62.26 to one decimal place. =
  5. 5.Round 42362 to the nearest thousand.
  6. 6.Round 47191 to the nearest ten.
  7. 7.Which is closest to 3602 ÷ 39? (a) 45 (b) 180 (c) 900 (d) 90
  8. 8.Round 91.13 to one decimal place. =
  9. 9.Round 59.31 to one decimal place. =
  10. 10.Which is closest to 597 × 19? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  11. 11.Which is closest to 4495 ÷ 49? (a) 900 (b) 45 (c) 90 (d) 180
  12. 12.Which is closest to 698 × 19? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  13. 13.Round 24.19 to one decimal place. =
  14. 14.Which is closest to 196 × 78? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  15. 15.Which is closest to 2804 ÷ 41? (a) 140 (b) 700 (c) 35 (d) 70
  16. 16.Which is closest to 796 + 597 + 602? (a) 1900 (b) 2200 (c) 2100 (d) 2000
  17. 17.Round 91431 to the nearest hundred.
  18. 18.Round 88064 to the nearest thousand.
  19. 19.Which is closest to 600 ÷ 29? (a) 200 (b) 10 (c) 40 (d) 20
  20. 20.Which is closest to 3992 ÷ 49? (a) 160 (b) 80 (c) 40 (d) 800
  21. 21.Which is closest to 597 ÷ 29? (a) 40 (b) 10 (c) 20 (d) 200
  22. 22.Which is closest to 396 × 88? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  23. 23.Round 62.86 to one decimal place. =
  24. 24.Which is closest to 305 + 598 + 798? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  25. 25.Round 19841 to the nearest hundred.
  26. 26.Round 10552 to the nearest hundred.
  27. 27.Round 25414 to the nearest thousand.
  28. 28.Round 20.93 to one decimal place. =
  29. 29.Round 99033 to the nearest hundred.
  30. 30.Round 53.88 to one decimal place. =
  31. 31.Which is closest to 403 × 28? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  32. 32.Round 95.74 to one decimal place. =
  33. 33.Round 97.31 to one decimal place. =
  34. 34.Which is closest to 496 × 31? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  35. 35.Round 53.92 to one decimal place. =
  36. 36.Which is closest to 804 × 81? (Round each number first.) (a) 6400 (b) 640000 (c) 64000 (d) 128000
  37. 37.Round 15.78 to one decimal place. =
  38. 38.Round 90.39 to one decimal place. =
  39. 39.Round 31.93 to one decimal place. =
  40. 40.Which is closest to 199 × 40? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000

Answer key

  1. 1600
  2. 27570
  3. 50
  4. 62.3
  5. 42000
  6. 47190
  7. 90
  8. 91.1
  9. 59.3
  10. 12000
  11. 90
  12. 14000
  13. 24.2
  14. 16000
  15. 70
  16. 2000
  17. 91400
  18. 88000
  19. 20
  20. 80
  21. 20
  22. 36000
  23. 62.9
  24. 1700
  25. 19800
  26. 10600
  27. 25000
  28. 20.9
  29. 99000
  30. 53.9
  31. 12000
  32. 95.7
  33. 97.3
  34. 15000
  35. 53.9
  36. 64000
  37. 15.8
  38. 90.4
  39. 31.9
  40. 8000

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