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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 522 · 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 95 + 97 + 299? (a) 700 (b) 500 (c) 400 (d) 600
  2. 2.Which is closest to 1792 ÷ 19? (a) 180 (b) 45 (c) 90 (d) 900
  3. 3.Round 19394 to the nearest hundred.
  4. 4.Which is closest to 596 + 502 + 503? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  5. 5.Which is closest to 805 ÷ 19? (a) 40 (b) 80 (c) 20 (d) 400
  6. 6.Which is closest to 902 + 505 + 795? (a) 2300 (b) 2200 (c) 2400 (d) 2100
  7. 7.Which is closest to 798 + 697 + 596? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  8. 8.Which is closest to 498 × 31? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  9. 9.Round 72.66 to one decimal place. =
  10. 10.Which is closest to 198 + 501 + 299? (a) 1100 (b) 1000 (c) 900 (d) 1200
  11. 11.Round 30157 to the nearest ten.
  12. 12.Which is closest to 298 × 70? (Round each number first.) (a) 21000 (b) 42000 (c) 2100 (d) 210000
  13. 13.Which is closest to 302 × 69? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  14. 14.Which is closest to 700 × 19? (Round each number first.) (a) 14000 (b) 28000 (c) 1400 (d) 140000
  15. 15.Which is closest to 801 × 51? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  16. 16.Round 97.47 to one decimal place. =
  17. 17.Round 74.94 to one decimal place. =
  18. 18.Which is closest to 596 + 601 + 299? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  19. 19.Round 64.13 to one decimal place. =
  20. 20.Which is closest to 397 + 496 + 701? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  21. 21.Round 30.27 to one decimal place. =
  22. 22.Round 65017 to the nearest thousand.
  23. 23.Which is closest to 1008 ÷ 51? (a) 20 (b) 40 (c) 10 (d) 200
  24. 24.Round 71944 to the nearest hundred.
  25. 25.Round 23845 to the nearest hundred.
  26. 26.Which is closest to 203 + 901 + 397? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  27. 27.Which is closest to 999 ÷ 19? (a) 25 (b) 100 (c) 50 (d) 500
  28. 28.Which is closest to 903 + 705 + 804? (a) 2600 (b) 2500 (c) 2300 (d) 2400
  29. 29.Round 44891 to the nearest thousand.
  30. 30.Round 40.34 to one decimal place. =
  31. 31.Round 16591 to the nearest hundred.
  32. 32.Which is closest to 204 × 70? (Round each number first.) (a) 28000 (b) 140000 (c) 1400 (d) 14000
  33. 33.Round 19669 to the nearest thousand.
  34. 34.Which is closest to 401 × 81? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  35. 35.Which is closest to 599 ÷ 19? (a) 60 (b) 15 (c) 30 (d) 300
  36. 36.Which is closest to 695 + 404 + 804? (a) 2000 (b) 1900 (c) 2100 (d) 1800
  37. 37.Round 23035 to the nearest thousand.
  38. 38.Which is closest to 97 + 495 + 299? (a) 1000 (b) 800 (c) 1100 (d) 900
  39. 39.Which is closest to 304 × 31? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  40. 40.Round 21.36 to one decimal place. =

Answer key

  1. 500
  2. 90
  3. 19400
  4. 1600
  5. 40
  6. 2200
  7. 2100
  8. 15000
  9. 72.7
  10. 1000
  11. 30160
  12. 21000
  13. 21000
  14. 14000
  15. 40000
  16. 97.5
  17. 74.9
  18. 1500
  19. 64.1
  20. 1600
  21. 30.3
  22. 65000
  23. 20
  24. 71900
  25. 23800
  26. 1500
  27. 50
  28. 2400
  29. 45000
  30. 40.3
  31. 16600
  32. 14000
  33. 20000
  34. 32000
  35. 30
  36. 1900
  37. 23000
  38. 900
  39. 9000
  40. 21.4

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