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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 610 · 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 202 × 49? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
  2. 2.Which is closest to 2805 ÷ 41? (a) 140 (b) 700 (c) 70 (d) 35
  3. 3.Which is closest to 397 × 88? (Round each number first.) (a) 36000 (b) 72000 (c) 360000 (d) 3600
  4. 4.Round 66136 to the nearest hundred.
  5. 5.Round 15.17 to one decimal place. =
  6. 6.Which is closest to 303 × 82? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  7. 7.Which is closest to 803 + 205 + 903? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  8. 8.Which is closest to 699 + 198 + 305? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  9. 9.Which is closest to 3994 ÷ 49? (a) 800 (b) 160 (c) 80 (d) 40
  10. 10.Round 10138 to the nearest thousand.
  11. 11.Round 46.48 to one decimal place. =
  12. 12.Which is closest to 896 × 22? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  13. 13.Round 8154 to the nearest hundred.
  14. 14.Round 79650 to the nearest thousand.
  15. 15.Round 26.22 to one decimal place. =
  16. 16.Round 91535 to the nearest hundred.
  17. 17.Which is closest to 799 × 91? (Round each number first.) (a) 72000 (b) 720000 (c) 144000 (d) 7200
  18. 18.Which is closest to 203 + 303 + 403? (a) 1000 (b) 1100 (c) 800 (d) 900
  19. 19.Which is closest to 604 + 95 + 899? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  20. 20.Which is closest to 796 × 61? (Round each number first.) (a) 480000 (b) 4800 (c) 96000 (d) 48000
  21. 21.Which is closest to 95 + 400 + 595? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  22. 22.Round 64.57 to one decimal place. =
  23. 23.Which is closest to 796 × 91? (Round each number first.) (a) 144000 (b) 72000 (c) 7200 (d) 720000
  24. 24.Round 86480 to the nearest hundred.
  25. 25.Which is closest to 501 + 101 + 696? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  26. 26.Which is closest to 704 + 800 + 797? (a) 2400 (b) 2500 (c) 2300 (d) 2200
  27. 27.Round 23.89 to one decimal place. =
  28. 28.Which is closest to 498 × 91? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  29. 29.Round 68362 to the nearest ten.
  30. 30.Which is closest to 703 × 28? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000
  31. 31.Round 53823 to the nearest thousand.
  32. 32.Round 12.41 to one decimal place. =
  33. 33.Which is closest to 205 + 105 + 98? (a) 500 (b) 300 (c) 600 (d) 400
  34. 34.Which is closest to 801 + 605 + 103? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  35. 35.Round 14768 to the nearest thousand.
  36. 36.Which is closest to 1594 ÷ 21? (a) 80 (b) 160 (c) 800 (d) 40
  37. 37.Which is closest to 892 ÷ 31? (a) 300 (b) 15 (c) 30 (d) 60
  38. 38.Which is closest to 298 × 31? (Round each number first.) (a) 900 (b) 9000 (c) 90000 (d) 18000
  39. 39.Which is closest to 798 ÷ 39? (a) 200 (b) 40 (c) 10 (d) 20
  40. 40.Which is closest to 296 × 40? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000

Answer key

  1. 10000
  2. 70
  3. 36000
  4. 66100
  5. 15.2
  6. 24000
  7. 1900
  8. 1200
  9. 80
  10. 10000
  11. 46.5
  12. 18000
  13. 8200
  14. 80000
  15. 26.2
  16. 91500
  17. 72000
  18. 900
  19. 1600
  20. 48000
  21. 1100
  22. 64.6
  23. 72000
  24. 86500
  25. 1300
  26. 2300
  27. 23.9
  28. 45000
  29. 68360
  30. 21000
  31. 54000
  32. 12.4
  33. 400
  34. 1500
  35. 15000
  36. 80
  37. 30
  38. 9000
  39. 20
  40. 12000

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