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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 146 · 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 32.06 to one decimal place. =
  2. 2.Which is closest to 3205 ÷ 39? (a) 160 (b) 40 (c) 80 (d) 800
  3. 3.Which is closest to 96 + 497 + 704? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  4. 4.Round 88.42 to one decimal place. =
  5. 5.Which is closest to 1001 ÷ 19? (a) 100 (b) 50 (c) 25 (d) 500
  6. 6.Round 66.12 to one decimal place. =
  7. 7.Round 38.81 to one decimal place. =
  8. 8.Round 10.17 to one decimal place. =
  9. 9.Which is closest to 897 + 902 + 197? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  10. 10.Round 21.17 to one decimal place. =
  11. 11.Round 86.89 to one decimal place. =
  12. 12.Which is closest to 2694 ÷ 31? (a) 45 (b) 180 (c) 900 (d) 90
  13. 13.Which is closest to 1200 ÷ 21? (a) 120 (b) 30 (c) 60 (d) 600
  14. 14.Which is closest to 196 × 30? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  15. 15.Which is closest to 798 × 48? (Round each number first.) (a) 40000 (b) 4000 (c) 80000 (d) 400000
  16. 16.Which is closest to 796 × 79? (Round each number first.) (a) 640000 (b) 6400 (c) 64000 (d) 128000
  17. 17.Round 94357 to the nearest thousand.
  18. 18.Which is closest to 1797 ÷ 29? (a) 120 (b) 30 (c) 600 (d) 60
  19. 19.Which is closest to 396 + 199 + 405? (a) 1200 (b) 900 (c) 1100 (d) 1000
  20. 20.Which is closest to 101 + 597 + 397? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  21. 21.Round 82494 to the nearest hundred.
  22. 22.Round 45556 to the nearest thousand.
  23. 23.Which is closest to 2491 ÷ 49? (a) 50 (b) 100 (c) 500 (d) 25
  24. 24.Round 26131 to the nearest thousand.
  25. 25.Which is closest to 391 ÷ 21? (a) 40 (b) 200 (c) 10 (d) 20
  26. 26.Round 41.47 to one decimal place. =
  27. 27.Which is closest to 703 + 197 + 99? (a) 900 (b) 1000 (c) 1200 (d) 1100
  28. 28.Which is closest to 503 + 603 + 797? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  29. 29.Which is closest to 298 + 397 + 396? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  30. 30.Which is closest to 1606 ÷ 41? (a) 40 (b) 400 (c) 80 (d) 20
  31. 31.Round 42.56 to one decimal place. =
  32. 32.Which is closest to 3497 ÷ 49? (a) 700 (b) 35 (c) 70 (d) 140
  33. 33.Which is closest to 498 × 21? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  34. 34.Round 54188 to the nearest ten.
  35. 35.Round 35.12 to one decimal place. =
  36. 36.Round 86.78 to one decimal place. =
  37. 37.Which is closest to 802 × 29? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  38. 38.Which is closest to 499 × 80? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  39. 39.Round 64.21 to one decimal place. =
  40. 40.Which is closest to 196 × 69? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000

Answer key

  1. 32.1
  2. 80
  3. 1300
  4. 88.4
  5. 50
  6. 66.1
  7. 38.8
  8. 10.2
  9. 2000
  10. 21.2
  11. 86.9
  12. 90
  13. 60
  14. 6000
  15. 40000
  16. 64000
  17. 94000
  18. 60
  19. 1000
  20. 1100
  21. 82500
  22. 46000
  23. 50
  24. 26000
  25. 20
  26. 41.5
  27. 1000
  28. 1900
  29. 1100
  30. 40
  31. 42.6
  32. 70
  33. 10000
  34. 54190
  35. 35.1
  36. 86.8
  37. 24000
  38. 40000
  39. 64.2
  40. 14000

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