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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 852 · 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 399 + 597 + 303? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  2. 2.Round 29.37 to one decimal place. =
  3. 3.Which is closest to 401 × 62? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  4. 4.Which is closest to 600 + 697 + 904? (a) 2300 (b) 2400 (c) 2200 (d) 2100
  5. 5.Which is closest to 801 × 62? (Round each number first.) (a) 480000 (b) 4800 (c) 96000 (d) 48000
  6. 6.Which is closest to 796 + 203 + 397? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  7. 7.Which is closest to 402 × 51? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  8. 8.Round 28.76 to one decimal place. =
  9. 9.Round 77553 to the nearest thousand.
  10. 10.Round 21095 to the nearest hundred.
  11. 11.Which is closest to 3996 ÷ 51? (a) 160 (b) 40 (c) 800 (d) 80
  12. 12.Which is closest to 797 × 79? (Round each number first.) (a) 128000 (b) 640000 (c) 64000 (d) 6400
  13. 13.Which is closest to 3498 ÷ 49? (a) 35 (b) 140 (c) 70 (d) 700
  14. 14.Which is closest to 897 + 596 + 897? (a) 2300 (b) 2500 (c) 2600 (d) 2400
  15. 15.Which is closest to 196 + 901 + 397? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  16. 16.Which is closest to 1996 ÷ 39? (a) 100 (b) 500 (c) 25 (d) 50
  17. 17.Which is closest to 199 + 303 + 303? (a) 800 (b) 1000 (c) 700 (d) 900
  18. 18.Which is closest to 500 × 38? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  19. 19.Round 58446 to the nearest thousand.
  20. 20.Which is closest to 199 + 297 + 101? (a) 500 (b) 600 (c) 800 (d) 700
  21. 21.Round 72.21 to one decimal place. =
  22. 22.Which is closest to 3505 ÷ 49? (a) 140 (b) 35 (c) 700 (d) 70
  23. 23.Which is closest to 604 × 32? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  24. 24.Which is closest to 601 × 49? (Round each number first.) (a) 300000 (b) 60000 (c) 3000 (d) 30000
  25. 25.Which is closest to 299 + 901 + 503? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  26. 26.Which is closest to 1600 ÷ 19? (a) 40 (b) 800 (c) 80 (d) 160
  27. 27.Which is closest to 802 × 28? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  28. 28.Which is closest to 599 × 42? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  29. 29.Which is closest to 300 × 38? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  30. 30.Round 18475 to the nearest thousand.
  31. 31.Round 45771 to the nearest ten.
  32. 32.Round 30407 to the nearest ten.
  33. 33.Which is closest to 899 + 105 + 495? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  34. 34.Which is closest to 795 + 402 + 203? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  35. 35.Which is closest to 504 × 28? (Round each number first.) (a) 15000 (b) 150000 (c) 30000 (d) 1500
  36. 36.Round 38712 to the nearest ten.
  37. 37.Round 25.08 to one decimal place. =
  38. 38.Which is closest to 2006 ÷ 41? (a) 500 (b) 50 (c) 25 (d) 100
  39. 39.Round 18.16 to one decimal place. =
  40. 40.Round 71703 to the nearest ten.

Answer key

  1. 1300
  2. 29.4
  3. 24000
  4. 2200
  5. 48000
  6. 1400
  7. 20000
  8. 28.8
  9. 78000
  10. 21100
  11. 80
  12. 64000
  13. 70
  14. 2400
  15. 1500
  16. 50
  17. 800
  18. 20000
  19. 58000
  20. 600
  21. 72.2
  22. 70
  23. 18000
  24. 30000
  25. 1700
  26. 80
  27. 24000
  28. 24000
  29. 12000
  30. 18000
  31. 45770
  32. 30410
  33. 1500
  34. 1400
  35. 15000
  36. 38710
  37. 25.1
  38. 50
  39. 18.2
  40. 71700

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