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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 360 · 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 802 × 38? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  2. 2.Round 70.42 to one decimal place. =
  3. 3.Round 66847 to the nearest thousand.
  4. 4.Which is closest to 599 ÷ 29? (a) 10 (b) 40 (c) 20 (d) 200
  5. 5.Which is closest to 904 × 49? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  6. 6.Which is closest to 594 ÷ 29? (a) 20 (b) 200 (c) 10 (d) 40
  7. 7.Which is closest to 202 + 600 + 303? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  8. 8.Which is closest to 1199 ÷ 31? (a) 80 (b) 400 (c) 20 (d) 40
  9. 9.Round 83.56 to one decimal place. =
  10. 10.Round 19057 to the nearest thousand.
  11. 11.Which is closest to 592 ÷ 21? (a) 60 (b) 300 (c) 30 (d) 15
  12. 12.Which is closest to 498 × 30? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  13. 13.Which is closest to 595 ÷ 19? (a) 60 (b) 15 (c) 30 (d) 300
  14. 14.Which is closest to 496 + 95 + 797? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  15. 15.Round 92.78 to one decimal place. =
  16. 16.Round 57.51 to one decimal place. =
  17. 17.Which is closest to 696 × 28? (Round each number first.) (a) 21000 (b) 210000 (c) 42000 (d) 2100
  18. 18.Round 77.31 to one decimal place. =
  19. 19.Which is closest to 603 × 62? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  20. 20.Round 64.53 to one decimal place. =
  21. 21.Which is closest to 1196 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  22. 22.Which is closest to 604 × 89? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  23. 23.Which is closest to 296 + 605 + 300? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  24. 24.Which is closest to 1808 ÷ 31? (a) 600 (b) 60 (c) 120 (d) 30
  25. 25.Round 91334 to the nearest thousand.
  26. 26.Round 34276 to the nearest hundred.
  27. 27.Which is closest to 602 + 699 + 195? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  28. 28.Which is closest to 700 × 22? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  29. 29.Round 16540 to the nearest thousand.
  30. 30.Which is closest to 1508 ÷ 31? (a) 50 (b) 25 (c) 100 (d) 500
  31. 31.Which is closest to 896 × 39? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  32. 32.Which is closest to 501 × 18? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
  33. 33.Round 69.82 to one decimal place. =
  34. 34.Round 53.92 to one decimal place. =
  35. 35.Which is closest to 203 + 401 + 302? (a) 1100 (b) 1000 (c) 800 (d) 900
  36. 36.Which is closest to 699 + 901 + 603? (a) 2100 (b) 2400 (c) 2200 (d) 2300
  37. 37.Which is closest to 797 + 195 + 204? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  38. 38.Which is closest to 997 ÷ 21? (a) 25 (b) 50 (c) 100 (d) 500
  39. 39.Round 73651 to the nearest ten.
  40. 40.Round 85.13 to one decimal place. =

Answer key

  1. 32000
  2. 70.4
  3. 67000
  4. 20
  5. 45000
  6. 20
  7. 1100
  8. 40
  9. 83.6
  10. 19000
  11. 30
  12. 15000
  13. 30
  14. 1400
  15. 92.8
  16. 57.5
  17. 21000
  18. 77.3
  19. 36000
  20. 64.5
  21. 60
  22. 54000
  23. 1200
  24. 60
  25. 91000
  26. 34300
  27. 1500
  28. 14000
  29. 17000
  30. 50
  31. 36000
  32. 10000
  33. 69.8
  34. 53.9
  35. 900
  36. 2200
  37. 1200
  38. 50
  39. 73650
  40. 85.1

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