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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 964 · 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.Round 50.12 to one decimal place. =
  2. 2.Which is closest to 504 × 52? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  3. 3.Round 35.08 to one decimal place. =
  4. 4.Which is closest to 597 × 30? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  5. 5.Which is closest to 601 × 58? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  6. 6.Which is closest to 2406 ÷ 31? (a) 160 (b) 80 (c) 40 (d) 800
  7. 7.Round 26.68 to one decimal place. =
  8. 8.Round 14199 to the nearest thousand.
  9. 9.Which is closest to 2093 ÷ 31? (a) 140 (b) 700 (c) 70 (d) 35
  10. 10.Which is closest to 203 × 61? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  11. 11.Round 21163 to the nearest ten.
  12. 12.Which is closest to 1593 ÷ 41? (a) 400 (b) 20 (c) 40 (d) 80
  13. 13.Which is closest to 496 + 695 + 305? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  14. 14.Which is closest to 700 + 95 + 500? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  15. 15.Round 11302 to the nearest ten.
  16. 16.Which is closest to 402 + 502 + 602? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  17. 17.Round 51659 to the nearest thousand.
  18. 18.Round 53436 to the nearest thousand.
  19. 19.Which is closest to 3202 ÷ 39? (a) 160 (b) 40 (c) 800 (d) 80
  20. 20.Which is closest to 698 + 704 + 197? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  21. 21.Round 32.08 to one decimal place. =
  22. 22.Which is closest to 398 + 195 + 296? (a) 1100 (b) 900 (c) 800 (d) 1000
  23. 23.Which is closest to 997 ÷ 51? (a) 20 (b) 200 (c) 10 (d) 40
  24. 24.Round 44.66 to one decimal place. =
  25. 25.Which is closest to 396 × 32? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  26. 26.Which is closest to 705 + 396 + 705? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  27. 27.Which is closest to 1791 ÷ 21? (a) 45 (b) 900 (c) 90 (d) 180
  28. 28.Which is closest to 501 × 19? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  29. 29.Which is closest to 301 × 48? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
  30. 30.Which is closest to 299 × 89? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  31. 31.Which is closest to 399 + 699 + 404? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  32. 32.Round 21.36 to one decimal place. =
  33. 33.Round 40734 to the nearest thousand.
  34. 34.Round 10953 to the nearest ten.
  35. 35.Round 27.42 to one decimal place. =
  36. 36.Which is closest to 503 × 89? (Round each number first.) (a) 450000 (b) 45000 (c) 4500 (d) 90000
  37. 37.Which is closest to 1195 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  38. 38.Which is closest to 4508 ÷ 49? (a) 180 (b) 45 (c) 900 (d) 90
  39. 39.Round 48.38 to one decimal place. =
  40. 40.Which is closest to 697 + 296 + 903? (a) 1900 (b) 1800 (c) 2000 (d) 2100

Answer key

  1. 50.1
  2. 25000
  3. 35.1
  4. 18000
  5. 36000
  6. 80
  7. 26.7
  8. 14000
  9. 70
  10. 12000
  11. 21160
  12. 40
  13. 1500
  14. 1300
  15. 11300
  16. 1500
  17. 52000
  18. 53000
  19. 80
  20. 1600
  21. 32.1
  22. 900
  23. 20
  24. 44.7
  25. 12000
  26. 1800
  27. 90
  28. 10000
  29. 15000
  30. 27000
  31. 1500
  32. 21.4
  33. 41000
  34. 10950
  35. 27.4
  36. 45000
  37. 30
  38. 90
  39. 48.4
  40. 1900

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