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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 753 · 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 70.44 to one decimal place. =
  2. 2.Which is closest to 798 + 596 + 600? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  3. 3.Which is closest to 2392 ÷ 31? (a) 160 (b) 800 (c) 40 (d) 80
  4. 4.Round 38.67 to one decimal place. =
  5. 5.Which is closest to 802 × 72? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  6. 6.Which is closest to 499 + 604 + 496? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  7. 7.Which is closest to 301 + 701 + 798? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  8. 8.Which is closest to 500 × 88? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
  9. 9.Which is closest to 3196 ÷ 39? (a) 800 (b) 80 (c) 40 (d) 160
  10. 10.Which is closest to 396 × 51? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
  11. 11.Which is closest to 204 × 78? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  12. 12.Round 83.83 to one decimal place. =
  13. 13.Which is closest to 1508 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
  14. 14.Round 94501 to the nearest hundred.
  15. 15.Which is closest to 304 × 29? (Round each number first.) (a) 90000 (b) 9000 (c) 18000 (d) 900
  16. 16.Round 91.38 to one decimal place. =
  17. 17.Which is closest to 797 + 701 + 603? (a) 2200 (b) 2000 (c) 2100 (d) 2300
  18. 18.Which is closest to 808 ÷ 41? (a) 20 (b) 200 (c) 10 (d) 40
  19. 19.Round 79.14 to one decimal place. =
  20. 20.Round 7952 to the nearest ten.
  21. 21.Which is closest to 605 + 200 + 795? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  22. 22.Which is closest to 296 + 98 + 505? (a) 800 (b) 900 (c) 1100 (d) 1000
  23. 23.Which is closest to 497 + 196 + 298? (a) 1200 (b) 900 (c) 1100 (d) 1000
  24. 24.Which is closest to 595 + 205 + 299? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  25. 25.Which is closest to 797 × 48? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  26. 26.Which is closest to 898 × 72? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
  27. 27.Which is closest to 702 × 31? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  28. 28.Which is closest to 200 × 58? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  29. 29.Round 69.09 to one decimal place. =
  30. 30.Which is closest to 701 + 102 + 200? (a) 1000 (b) 1100 (c) 1200 (d) 900
  31. 31.Which is closest to 404 × 42? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  32. 32.Which is closest to 398 + 500 + 305? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  33. 33.Round 95153 to the nearest thousand.
  34. 34.Round 44.07 to one decimal place. =
  35. 35.Round 48.61 to one decimal place. =
  36. 36.Which is closest to 597 + 795 + 697? (a) 2300 (b) 2100 (c) 2000 (d) 2200
  37. 37.Which is closest to 791 ÷ 41? (a) 40 (b) 200 (c) 10 (d) 20
  38. 38.Which is closest to 1198 ÷ 41? (a) 15 (b) 300 (c) 30 (d) 60
  39. 39.Round 56.92 to one decimal place. =
  40. 40.Which is closest to 3202 ÷ 39? (a) 160 (b) 800 (c) 80 (d) 40

Answer key

  1. 70.4
  2. 2000
  3. 80
  4. 38.7
  5. 56000
  6. 1600
  7. 1800
  8. 45000
  9. 80
  10. 20000
  11. 16000
  12. 83.8
  13. 50
  14. 94500
  15. 9000
  16. 91.4
  17. 2100
  18. 20
  19. 79.1
  20. 7950
  21. 1600
  22. 900
  23. 1000
  24. 1100
  25. 40000
  26. 63000
  27. 21000
  28. 12000
  29. 69.1
  30. 1000
  31. 16000
  32. 1200
  33. 95000
  34. 44.1
  35. 48.6
  36. 2100
  37. 20
  38. 30
  39. 56.9
  40. 80

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