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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 151 · 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 702 + 505 + 796? (a) 2200 (b) 2100 (c) 2000 (d) 1900
  2. 2.Round 30.82 to one decimal place. =
  3. 3.Which is closest to 799 ÷ 41? (a) 200 (b) 20 (c) 40 (d) 10
  4. 4.Round 9701 to the nearest hundred.
  5. 5.Which is closest to 1791 ÷ 29? (a) 30 (b) 600 (c) 120 (d) 60
  6. 6.Which is closest to 392 ÷ 19? (a) 20 (b) 10 (c) 200 (d) 40
  7. 7.Which is closest to 502 × 50? (Round each number first.) (a) 50000 (b) 2500 (c) 250000 (d) 25000
  8. 8.Which is closest to 804 × 18? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  9. 9.Which is closest to 398 ÷ 19? (a) 40 (b) 10 (c) 20 (d) 200
  10. 10.Round 79.57 to one decimal place. =
  11. 11.Which is closest to 802 × 69? (Round each number first.) (a) 112000 (b) 560000 (c) 5600 (d) 56000
  12. 12.Which is closest to 205 + 702 + 298? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  13. 13.Which is closest to 807 ÷ 39? (a) 40 (b) 200 (c) 20 (d) 10
  14. 14.Which is closest to 1002 ÷ 49? (a) 200 (b) 10 (c) 20 (d) 40
  15. 15.Round 70454 to the nearest hundred.
  16. 16.Round 33314 to the nearest ten.
  17. 17.Round 2649 to the nearest hundred.
  18. 18.Round 35472 to the nearest ten.
  19. 19.Which is closest to 204 × 81? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  20. 20.Round 14.19 to one decimal place. =
  21. 21.Which is closest to 2509 ÷ 51? (a) 25 (b) 50 (c) 100 (d) 500
  22. 22.Which is closest to 701 × 80? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  23. 23.Round 42.79 to one decimal place. =
  24. 24.Which is closest to 704 + 603 + 97? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  25. 25.Which is closest to 201 × 82? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  26. 26.Which is closest to 601 × 52? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  27. 27.Which is closest to 104 + 103 + 101? (a) 400 (b) 500 (c) 300 (d) 200
  28. 28.Which is closest to 2697 ÷ 31? (a) 900 (b) 180 (c) 45 (d) 90
  29. 29.Round 74982 to the nearest hundred.
  30. 30.Which is closest to 105 + 402 + 500? (a) 1200 (b) 900 (c) 1000 (d) 1100
  31. 31.Which is closest to 704 × 78? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  32. 32.Round 30.54 to one decimal place. =
  33. 33.Which is closest to 895 + 200 + 796? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  34. 34.Round 53.36 to one decimal place. =
  35. 35.Which is closest to 2496 ÷ 51? (a) 25 (b) 50 (c) 500 (d) 100
  36. 36.Round 91132 to the nearest ten.
  37. 37.Round 94.86 to one decimal place. =
  38. 38.Round 87.32 to one decimal place. =
  39. 39.Round 78479 to the nearest ten.
  40. 40.Which is closest to 898 + 303 + 604? (a) 1700 (b) 1800 (c) 1900 (d) 2000

Answer key

  1. 2000
  2. 30.8
  3. 20
  4. 9700
  5. 60
  6. 20
  7. 25000
  8. 16000
  9. 20
  10. 79.6
  11. 56000
  12. 1200
  13. 20
  14. 20
  15. 70500
  16. 33310
  17. 2600
  18. 35470
  19. 16000
  20. 14.2
  21. 50
  22. 56000
  23. 42.8
  24. 1400
  25. 16000
  26. 30000
  27. 300
  28. 90
  29. 75000
  30. 1000
  31. 56000
  32. 30.5
  33. 1900
  34. 53.4
  35. 50
  36. 91130
  37. 94.9
  38. 87.3
  39. 78480
  40. 1800

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