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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 921 · 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 898 + 598 + 896? (a) 2600 (b) 2500 (c) 2400 (d) 2300
  2. 2.Which is closest to 1998 ÷ 39? (a) 100 (b) 25 (c) 500 (d) 50
  3. 3.Round 87.56 to one decimal place. =
  4. 4.Round 30.32 to one decimal place. =
  5. 5.Which is closest to 802 + 596 + 103? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  6. 6.Which is closest to 603 + 902 + 803? (a) 2200 (b) 2500 (c) 2300 (d) 2400
  7. 7.Round 74275 to the nearest hundred.
  8. 8.Which is closest to 801 × 29? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  9. 9.Which is closest to 197 × 48? (Round each number first.) (a) 1000 (b) 100000 (c) 20000 (d) 10000
  10. 10.Which is closest to 399 + 904 + 101? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  11. 11.Round 31907 to the nearest thousand.
  12. 12.Round 22834 to the nearest ten.
  13. 13.Which is closest to 96 + 703 + 905? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  14. 14.Which is closest to 99 + 599 + 499? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  15. 15.Round 80801 to the nearest ten.
  16. 16.Which is closest to 3005 ÷ 51? (a) 120 (b) 600 (c) 60 (d) 30
  17. 17.Which is closest to 4492 ÷ 51? (a) 180 (b) 900 (c) 90 (d) 45
  18. 18.Round 98.77 to one decimal place. =
  19. 19.Which is closest to 1203 ÷ 21? (a) 600 (b) 60 (c) 30 (d) 120
  20. 20.Round 44.92 to one decimal place. =
  21. 21.Which is closest to 298 × 20? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  22. 22.Which is closest to 1800 ÷ 29? (a) 600 (b) 120 (c) 30 (d) 60
  23. 23.Which is closest to 2402 ÷ 31? (a) 80 (b) 160 (c) 800 (d) 40
  24. 24.Which is closest to 1508 ÷ 31? (a) 25 (b) 50 (c) 500 (d) 100
  25. 25.Round 91387 to the nearest thousand.
  26. 26.Which is closest to 497 × 42? (Round each number first.) (a) 20000 (b) 200000 (c) 2000 (d) 40000
  27. 27.Which is closest to 405 ÷ 19? (a) 20 (b) 200 (c) 10 (d) 40
  28. 28.Which is closest to 605 + 195 + 297? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  29. 29.Round 7658 to the nearest thousand.
  30. 30.Which is closest to 1392 ÷ 19? (a) 35 (b) 70 (c) 700 (d) 140
  31. 31.Round 23894 to the nearest thousand.
  32. 32.Which is closest to 595 + 796 + 697? (a) 2200 (b) 2100 (c) 2300 (d) 2000
  33. 33.Which is closest to 897 + 96 + 400? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  34. 34.Round 33.28 to one decimal place. =
  35. 35.Round 30.73 to one decimal place. =
  36. 36.Round 17.09 to one decimal place. =
  37. 37.Round 80.52 to one decimal place. =
  38. 38.Round 17210 to the nearest hundred.
  39. 39.Which is closest to 696 + 305 + 96? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  40. 40.Which is closest to 198 × 49? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000

Answer key

  1. 2400
  2. 50
  3. 87.6
  4. 30.3
  5. 1500
  6. 2300
  7. 74300
  8. 24000
  9. 10000
  10. 1400
  11. 32000
  12. 22830
  13. 1700
  14. 1200
  15. 80800
  16. 60
  17. 90
  18. 98.8
  19. 60
  20. 44.9
  21. 6000
  22. 60
  23. 80
  24. 50
  25. 91000
  26. 20000
  27. 20
  28. 1100
  29. 8000
  30. 70
  31. 24000
  32. 2100
  33. 1400
  34. 33.3
  35. 30.7
  36. 17.1
  37. 80.5
  38. 17200
  39. 1100
  40. 10000

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