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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 476 · 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 × 81? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  2. 2.Which is closest to 2803 ÷ 39? (a) 700 (b) 140 (c) 70 (d) 35
  3. 3.Which is closest to 602 × 89? (Round each number first.) (a) 108000 (b) 54000 (c) 540000 (d) 5400
  4. 4.Round 94739 to the nearest hundred.
  5. 5.Which is closest to 401 ÷ 19? (a) 200 (b) 40 (c) 20 (d) 10
  6. 6.Which is closest to 396 × 80? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
  7. 7.Which is closest to 3202 ÷ 41? (a) 800 (b) 160 (c) 80 (d) 40
  8. 8.Round 51031 to the nearest ten.
  9. 9.Which is closest to 196 × 59? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  10. 10.Which is closest to 202 × 70? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  11. 11.Which is closest to 497 + 796 + 502? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  12. 12.Round 67.76 to one decimal place. =
  13. 13.Which is closest to 402 × 69? (Round each number first.) (a) 280000 (b) 28000 (c) 2800 (d) 56000
  14. 14.Which is closest to 100 + 696 + 101? (a) 1000 (b) 900 (c) 800 (d) 1100
  15. 15.Round 16.71 to one decimal place. =
  16. 16.Which is closest to 296 + 400 + 504? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  17. 17.Round 74.29 to one decimal place. =
  18. 18.Which is closest to 301 + 103 + 799? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  19. 19.Which is closest to 197 × 89? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  20. 20.Which is closest to 799 + 597 + 204? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  21. 21.Round 30.88 to one decimal place. =
  22. 22.Round 19.39 to one decimal place. =
  23. 23.Which is closest to 1798 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60
  24. 24.Round 61323 to the nearest hundred.
  25. 25.Round 34.47 to one decimal place. =
  26. 26.Round 71397 to the nearest ten.
  27. 27.Which is closest to 504 × 49? (Round each number first.) (a) 250000 (b) 50000 (c) 2500 (d) 25000
  28. 28.Round 83.78 to one decimal place. =
  29. 29.Round 57564 to the nearest thousand.
  30. 30.Round 62.12 to one decimal place. =
  31. 31.Which is closest to 703 + 696 + 295? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  32. 32.Which is closest to 204 + 96 + 105? (a) 400 (b) 500 (c) 300 (d) 600
  33. 33.Which is closest to 697 + 303 + 601? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  34. 34.Which is closest to 401 × 89? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  35. 35.Round 57917 to the nearest thousand.
  36. 36.Round 73.24 to one decimal place. =
  37. 37.Which is closest to 1606 ÷ 19? (a) 800 (b) 40 (c) 80 (d) 160
  38. 38.Round 75.43 to one decimal place. =
  39. 39.Round 4199 to the nearest ten.
  40. 40.Which is closest to 397 + 703 + 199? (a) 1400 (b) 1300 (c) 1200 (d) 1500

Answer key

  1. 40000
  2. 70
  3. 54000
  4. 94700
  5. 20
  6. 32000
  7. 80
  8. 51030
  9. 12000
  10. 14000
  11. 1800
  12. 67.8
  13. 28000
  14. 900
  15. 16.7
  16. 1200
  17. 74.3
  18. 1200
  19. 18000
  20. 1600
  21. 30.9
  22. 19.4
  23. 60
  24. 61300
  25. 34.5
  26. 71400
  27. 25000
  28. 83.8
  29. 58000
  30. 62.1
  31. 1700
  32. 400
  33. 1600
  34. 36000
  35. 58000
  36. 73.2
  37. 80
  38. 75.4
  39. 4200
  40. 1300

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