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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 379 · 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 200 + 699 + 696? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  2. 2.Which is closest to 397 × 31? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  3. 3.Round 62.48 to one decimal place. =
  4. 4.Which is closest to 797 + 297 + 701? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  5. 5.Round 68.72 to one decimal place. =
  6. 6.Which is closest to 795 ÷ 41? (a) 200 (b) 20 (c) 40 (d) 10
  7. 7.Which is closest to 305 + 195 + 99? (a) 600 (b) 800 (c) 500 (d) 700
  8. 8.Which is closest to 1206 ÷ 21? (a) 30 (b) 60 (c) 600 (d) 120
  9. 9.Which is closest to 297 + 401 + 497? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  10. 10.Round 67524 to the nearest ten.
  11. 11.Which is closest to 908 ÷ 31? (a) 300 (b) 15 (c) 30 (d) 60
  12. 12.Round 33.29 to one decimal place. =
  13. 13.Round 85.92 to one decimal place. =
  14. 14.Which is closest to 705 + 504 + 201? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  15. 15.Which is closest to 496 + 695 + 895? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  16. 16.Which is closest to 1801 ÷ 19? (a) 900 (b) 90 (c) 180 (d) 45
  17. 17.Which is closest to 798 × 29? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  18. 18.Round 72.22 to one decimal place. =
  19. 19.Which is closest to 404 + 403 + 304? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  20. 20.Round 14004 to the nearest hundred.
  21. 21.Which is closest to 991 ÷ 19? (a) 500 (b) 100 (c) 25 (d) 50
  22. 22.Which is closest to 802 + 97 + 796? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  23. 23.Round 81.42 to one decimal place. =
  24. 24.Which is closest to 598 + 697 + 305? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  25. 25.Round 20.14 to one decimal place. =
  26. 26.Which is closest to 3202 ÷ 39? (a) 80 (b) 800 (c) 40 (d) 160
  27. 27.Round 40506 to the nearest hundred.
  28. 28.Round 76.58 to one decimal place. =
  29. 29.Which is closest to 4002 ÷ 49? (a) 40 (b) 80 (c) 800 (d) 160
  30. 30.Round 54424 to the nearest ten.
  31. 31.Round 28069 to the nearest hundred.
  32. 32.Which is closest to 702 × 22? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  33. 33.Round 32.32 to one decimal place. =
  34. 34.Round 37.49 to one decimal place. =
  35. 35.Which is closest to 703 + 402 + 896? (a) 2000 (b) 2100 (c) 1900 (d) 2200
  36. 36.Which is closest to 1993 ÷ 49? (a) 400 (b) 40 (c) 20 (d) 80
  37. 37.Which is closest to 497 × 21? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  38. 38.Round 65.44 to one decimal place. =
  39. 39.Which is closest to 97 + 397 + 399? (a) 1100 (b) 800 (c) 1000 (d) 900
  40. 40.Round 15620 to the nearest thousand.

Answer key

  1. 1600
  2. 12000
  3. 62.5
  4. 1800
  5. 68.7
  6. 20
  7. 600
  8. 60
  9. 1200
  10. 67520
  11. 30
  12. 33.3
  13. 85.9
  14. 1400
  15. 2100
  16. 90
  17. 24000
  18. 72.2
  19. 1100
  20. 14000
  21. 50
  22. 1700
  23. 81.4
  24. 1600
  25. 20.1
  26. 80
  27. 40500
  28. 76.6
  29. 80
  30. 54420
  31. 28100
  32. 14000
  33. 32.3
  34. 37.5
  35. 2000
  36. 40
  37. 10000
  38. 65.4
  39. 900
  40. 16000

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