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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 300 · 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 401 × 51? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  2. 2.Round 79.87 to one decimal place. =
  3. 3.Which is closest to 198 + 402 + 796? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  4. 4.Which is closest to 903 × 39? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  5. 5.Round 82089 to the nearest hundred.
  6. 6.Round 23.72 to one decimal place. =
  7. 7.Which is closest to 1594 ÷ 21? (a) 80 (b) 40 (c) 800 (d) 160
  8. 8.Which is closest to 1992 ÷ 41? (a) 50 (b) 25 (c) 500 (d) 100
  9. 9.Round 58.88 to one decimal place. =
  10. 10.Round 8146 to the nearest thousand.
  11. 11.Which is closest to 497 × 89? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  12. 12.Which is closest to 3995 ÷ 51? (a) 40 (b) 800 (c) 160 (d) 80
  13. 13.Round 34.31 to one decimal place. =
  14. 14.Which is closest to 104 + 98 + 903? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  15. 15.Which is closest to 399 + 702 + 605? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  16. 16.Round 59292 to the nearest ten.
  17. 17.Which is closest to 198 × 91? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  18. 18.Which is closest to 798 + 603 + 603? (a) 2100 (b) 2000 (c) 2200 (d) 1900
  19. 19.Which is closest to 900 + 104 + 605? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  20. 20.Which is closest to 807 ÷ 19? (a) 40 (b) 80 (c) 20 (d) 400
  21. 21.Which is closest to 598 + 703 + 799? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  22. 22.Which is closest to 2392 ÷ 39? (a) 30 (b) 600 (c) 120 (d) 60
  23. 23.Which is closest to 497 × 31? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  24. 24.Round 5466 to the nearest hundred.
  25. 25.Round 81.44 to one decimal place. =
  26. 26.Round 13.73 to one decimal place. =
  27. 27.Which is closest to 804 + 95 + 699? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  28. 28.Round 76.43 to one decimal place. =
  29. 29.Which is closest to 699 + 297 + 100? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  30. 30.Which is closest to 604 + 795 + 100? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  31. 31.Round 95.53 to one decimal place. =
  32. 32.Which is closest to 602 + 398 + 496? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  33. 33.Round 83.27 to one decimal place. =
  34. 34.Round 39102 to the nearest hundred.
  35. 35.Which is closest to 397 × 70? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  36. 36.Which is closest to 899 + 97 + 896? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  37. 37.Round 81.52 to one decimal place. =
  38. 38.Which is closest to 603 × 52? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  39. 39.Round 75.32 to one decimal place. =
  40. 40.Which is closest to 695 + 502 + 901? (a) 2300 (b) 2100 (c) 2000 (d) 2200

Answer key

  1. 20000
  2. 79.9
  3. 1400
  4. 36000
  5. 82100
  6. 23.7
  7. 80
  8. 50
  9. 58.9
  10. 8000
  11. 45000
  12. 80
  13. 34.3
  14. 1100
  15. 1700
  16. 59290
  17. 18000
  18. 2000
  19. 1600
  20. 40
  21. 2100
  22. 60
  23. 15000
  24. 5500
  25. 81.4
  26. 13.7
  27. 1600
  28. 76.4
  29. 1100
  30. 1500
  31. 95.5
  32. 1500
  33. 83.3
  34. 39100
  35. 28000
  36. 1900
  37. 81.5
  38. 30000
  39. 75.3
  40. 2100

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