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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 809 · 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 1499 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
  2. 2.Which is closest to 1798 ÷ 31? (a) 600 (b) 30 (c) 60 (d) 120
  3. 3.Which is closest to 1197 ÷ 21? (a) 600 (b) 30 (c) 120 (d) 60
  4. 4.Round 99.42 to one decimal place. =
  5. 5.Round 6283 to the nearest hundred.
  6. 6.Which is closest to 301 + 200 + 398? (a) 1000 (b) 800 (c) 1100 (d) 900
  7. 7.Which is closest to 4494 ÷ 49? (a) 180 (b) 45 (c) 90 (d) 900
  8. 8.Round 21.56 to one decimal place. =
  9. 9.Round 99773 to the nearest ten.
  10. 10.Round 57.81 to one decimal place. =
  11. 11.Round 80.33 to one decimal place. =
  12. 12.Which is closest to 804 + 495 + 98? (a) 1400 (b) 1500 (c) 1600 (d) 1300
  13. 13.Which is closest to 497 × 68? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  14. 14.Round 60.72 to one decimal place. =
  15. 15.Which is closest to 796 + 297 + 295? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  16. 16.Which is closest to 1506 ÷ 49? (a) 30 (b) 60 (c) 300 (d) 15
  17. 17.Which is closest to 703 × 51? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  18. 18.Which is closest to 198 × 50? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
  19. 19.Which is closest to 804 × 89? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  20. 20.Which is closest to 1503 ÷ 31? (a) 500 (b) 25 (c) 100 (d) 50
  21. 21.Round 38.67 to one decimal place. =
  22. 22.Which is closest to 1409 ÷ 21? (a) 140 (b) 70 (c) 35 (d) 700
  23. 23.Which is closest to 499 × 58? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  24. 24.Which is closest to 395 + 99 + 797? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  25. 25.Round 74.21 to one decimal place. =
  26. 26.Which is closest to 704 × 18? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  27. 27.Which is closest to 703 + 396 + 595? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  28. 28.Which is closest to 2803 ÷ 39? (a) 700 (b) 35 (c) 70 (d) 140
  29. 29.Which is closest to 599 ÷ 19? (a) 30 (b) 60 (c) 15 (d) 300
  30. 30.Which is closest to 397 + 101 + 701? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  31. 31.Which is closest to 304 × 38? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  32. 32.Which is closest to 304 + 699 + 700? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  33. 33.Which is closest to 2395 ÷ 31? (a) 80 (b) 160 (c) 800 (d) 40
  34. 34.Round 8457 to the nearest thousand.
  35. 35.Round 30.68 to one decimal place. =
  36. 36.Round 23166 to the nearest thousand.
  37. 37.Which is closest to 803 ÷ 19? (a) 80 (b) 40 (c) 400 (d) 20
  38. 38.Round 47.73 to one decimal place. =
  39. 39.Which is closest to 502 × 59? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  40. 40.Round 70225 to the nearest thousand.

Answer key

  1. 50
  2. 60
  3. 60
  4. 99.4
  5. 6300
  6. 900
  7. 90
  8. 21.6
  9. 99770
  10. 57.8
  11. 80.3
  12. 1400
  13. 35000
  14. 60.7
  15. 1400
  16. 30
  17. 35000
  18. 10000
  19. 72000
  20. 50
  21. 38.7
  22. 70
  23. 30000
  24. 1300
  25. 74.2
  26. 14000
  27. 1700
  28. 70
  29. 30
  30. 1200
  31. 12000
  32. 1700
  33. 80
  34. 8000
  35. 30.7
  36. 23000
  37. 40
  38. 47.7
  39. 30000
  40. 70000

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