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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 288 · 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 31.13 to one decimal place. =
  2. 2.Which is closest to 502 + 602 + 601? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  3. 3.Which is closest to 297 × 48? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  4. 4.Which is closest to 395 + 900 + 503? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  5. 5.Round 42.72 to one decimal place. =
  6. 6.Round 94967 to the nearest thousand.
  7. 7.Round 64466 to the nearest thousand.
  8. 8.Round 94.92 to one decimal place. =
  9. 9.Which is closest to 301 + 400 + 603? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  10. 10.Which is closest to 704 + 203 + 300? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  11. 11.Which is closest to 399 × 81? (Round each number first.) (a) 64000 (b) 320000 (c) 32000 (d) 3200
  12. 12.Which is closest to 796 × 30? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  13. 13.Round 99.52 to one decimal place. =
  14. 14.Which is closest to 799 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  15. 15.Round 18845 to the nearest thousand.
  16. 16.Which is closest to 398 + 198 + 204? (a) 800 (b) 700 (c) 1000 (d) 900
  17. 17.Round 1792 to the nearest thousand.
  18. 18.Which is closest to 98 + 305 + 296? (a) 600 (b) 900 (c) 700 (d) 800
  19. 19.Round 79.07 to one decimal place. =
  20. 20.Which is closest to 705 + 899 + 200? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  21. 21.Which is closest to 1200 ÷ 21? (a) 120 (b) 600 (c) 60 (d) 30
  22. 22.Round 20562 to the nearest ten.
  23. 23.Which is closest to 898 × 32? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  24. 24.Round 58639 to the nearest ten.
  25. 25.Which is closest to 598 × 29? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  26. 26.Which is closest to 2400 ÷ 29? (a) 160 (b) 80 (c) 800 (d) 40
  27. 27.Which is closest to 499 × 18? (Round each number first.) (a) 1000 (b) 10000 (c) 100000 (d) 20000
  28. 28.Which is closest to 1508 ÷ 29? (a) 500 (b) 25 (c) 50 (d) 100
  29. 29.Which is closest to 807 ÷ 21? (a) 400 (b) 40 (c) 80 (d) 20
  30. 30.Which is closest to 596 + 404 + 599? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  31. 31.Round 79.06 to one decimal place. =
  32. 32.Round 32.36 to one decimal place. =
  33. 33.Round 49197 to the nearest hundred.
  34. 34.Round 58.16 to one decimal place. =
  35. 35.Round 74.47 to one decimal place. =
  36. 36.Which is closest to 902 + 502 + 297? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  37. 37.Which is closest to 499 × 49? (Round each number first.) (a) 2500 (b) 250000 (c) 25000 (d) 50000
  38. 38.Round 43.61 to one decimal place. =
  39. 39.Which is closest to 403 + 502 + 702? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  40. 40.Which is closest to 997 ÷ 21? (a) 25 (b) 50 (c) 100 (d) 500

Answer key

  1. 31.1
  2. 1700
  3. 15000
  4. 1800
  5. 42.7
  6. 95000
  7. 64000
  8. 94.9
  9. 1300
  10. 1200
  11. 32000
  12. 24000
  13. 99.5
  14. 16000
  15. 19000
  16. 800
  17. 2000
  18. 700
  19. 79.1
  20. 1800
  21. 60
  22. 20560
  23. 27000
  24. 58640
  25. 18000
  26. 80
  27. 10000
  28. 50
  29. 40
  30. 1600
  31. 79.1
  32. 32.4
  33. 49200
  34. 58.2
  35. 74.5
  36. 1700
  37. 25000
  38. 43.6
  39. 1600
  40. 50

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