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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 372 · 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 2706 ÷ 29? (a) 900 (b) 45 (c) 90 (d) 180
  2. 2.Which is closest to 1601 ÷ 19? (a) 800 (b) 40 (c) 160 (d) 80
  3. 3.Which is closest to 304 + 701 + 400? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  4. 4.Round 37.09 to one decimal place. =
  5. 5.Round 49.46 to one decimal place. =
  6. 6.Which is closest to 599 × 28? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  7. 7.Which is closest to 794 ÷ 41? (a) 20 (b) 40 (c) 10 (d) 200
  8. 8.Round 20953 to the nearest hundred.
  9. 9.Round 79.67 to one decimal place. =
  10. 10.Which is closest to 1992 ÷ 39? (a) 100 (b) 50 (c) 25 (d) 500
  11. 11.Which is closest to 1797 ÷ 29? (a) 60 (b) 120 (c) 600 (d) 30
  12. 12.Which is closest to 1596 ÷ 19? (a) 40 (b) 160 (c) 80 (d) 800
  13. 13.Which is closest to 595 + 295 + 800? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  14. 14.Which is closest to 303 × 68? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  15. 15.Round 27.63 to one decimal place. =
  16. 16.Round 61.21 to one decimal place. =
  17. 17.Which is closest to 300 + 195 + 595? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  18. 18.Which is closest to 499 × 32? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  19. 19.Round 55.92 to one decimal place. =
  20. 20.Round 21.32 to one decimal place. =
  21. 21.Which is closest to 396 × 28? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  22. 22.Round 76044 to the nearest ten.
  23. 23.Which is closest to 1192 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  24. 24.Which is closest to 98 + 695 + 700? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  25. 25.Which is closest to 498 × 78? (Round each number first.) (a) 80000 (b) 40000 (c) 400000 (d) 4000
  26. 26.Round 66.12 to one decimal place. =
  27. 27.Round 76.17 to one decimal place. =
  28. 28.Round 89.23 to one decimal place. =
  29. 29.Round 49525 to the nearest thousand.
  30. 30.Which is closest to 497 × 21? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  31. 31.Which is closest to 296 + 201 + 602? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  32. 32.Which is closest to 1003 ÷ 19? (a) 25 (b) 500 (c) 50 (d) 100
  33. 33.Which is closest to 399 × 89? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  34. 34.Round 22.21 to one decimal place. =
  35. 35.Which is closest to 298 + 401 + 802? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  36. 36.Which is closest to 599 + 305 + 203? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  37. 37.Which is closest to 901 + 501 + 304? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  38. 38.Which is closest to 697 × 89? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  39. 39.Which is closest to 201 × 40? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  40. 40.Round 75.37 to one decimal place. =

Answer key

  1. 90
  2. 80
  3. 1400
  4. 37.1
  5. 49.5
  6. 18000
  7. 20
  8. 21000
  9. 79.7
  10. 50
  11. 60
  12. 80
  13. 1700
  14. 21000
  15. 27.6
  16. 61.2
  17. 1100
  18. 15000
  19. 55.9
  20. 21.3
  21. 12000
  22. 76040
  23. 60
  24. 1500
  25. 40000
  26. 66.1
  27. 76.2
  28. 89.2
  29. 50000
  30. 10000
  31. 1100
  32. 50
  33. 36000
  34. 22.2
  35. 1500
  36. 1100
  37. 1700
  38. 63000
  39. 8000
  40. 75.4

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