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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 173 · 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 603 × 20? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  2. 2.Which is closest to 3001 ÷ 51? (a) 600 (b) 30 (c) 60 (d) 120
  3. 3.Which is closest to 901 ÷ 31? (a) 300 (b) 60 (c) 15 (d) 30
  4. 4.Which is closest to 802 + 803 + 601? (a) 2100 (b) 2200 (c) 2400 (d) 2300
  5. 5.Round 13499 to the nearest thousand.
  6. 6.Round 17044 to the nearest hundred.
  7. 7.Which is closest to 601 ÷ 31? (a) 40 (b) 200 (c) 20 (d) 10
  8. 8.Round 34489 to the nearest ten.
  9. 9.Round 13.27 to one decimal place. =
  10. 10.Which is closest to 602 × 39? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  11. 11.Which is closest to 399 × 18? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  12. 12.Which is closest to 599 + 905 + 295? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  13. 13.Round 4115 to the nearest hundred.
  14. 14.Which is closest to 703 × 79? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
  15. 15.Which is closest to 2002 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  16. 16.Which is closest to 496 + 101 + 702? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  17. 17.Which is closest to 4493 ÷ 49? (a) 45 (b) 180 (c) 900 (d) 90
  18. 18.Round 48.22 to one decimal place. =
  19. 19.Which is closest to 1808 ÷ 31? (a) 30 (b) 120 (c) 60 (d) 600
  20. 20.Which is closest to 1204 ÷ 19? (a) 60 (b) 120 (c) 600 (d) 30
  21. 21.Which is closest to 598 + 298 + 700? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  22. 22.Which is closest to 302 × 30? (Round each number first.) (a) 900 (b) 90000 (c) 9000 (d) 18000
  23. 23.Which is closest to 800 × 32? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  24. 24.Which is closest to 401 × 59? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  25. 25.Round 39701 to the nearest hundred.
  26. 26.Round 7286 to the nearest thousand.
  27. 27.Which is closest to 900 + 204 + 201? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  28. 28.Round 87.33 to one decimal place. =
  29. 29.Which is closest to 201 × 29? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  30. 30.Round 42.82 to one decimal place. =
  31. 31.Round 65.74 to one decimal place. =
  32. 32.Round 77242 to the nearest hundred.
  33. 33.Which is closest to 599 × 38? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  34. 34.Which is closest to 795 + 605 + 398? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  35. 35.Which is closest to 902 × 20? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  36. 36.Which is closest to 799 + 800 + 505? (a) 2100 (b) 2300 (c) 2000 (d) 2200
  37. 37.Which is closest to 2793 ÷ 41? (a) 35 (b) 140 (c) 70 (d) 700
  38. 38.Round 8892 to the nearest hundred.
  39. 39.Which is closest to 301 + 601 + 802? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  40. 40.Which is closest to 395 ÷ 19? (a) 10 (b) 40 (c) 20 (d) 200

Answer key

  1. 12000
  2. 60
  3. 30
  4. 2200
  5. 13000
  6. 17000
  7. 20
  8. 34490
  9. 13.3
  10. 24000
  11. 8000
  12. 1800
  13. 4100
  14. 56000
  15. 50
  16. 1300
  17. 90
  18. 48.2
  19. 60
  20. 60
  21. 1600
  22. 9000
  23. 24000
  24. 24000
  25. 39700
  26. 7000
  27. 1300
  28. 87.3
  29. 6000
  30. 42.8
  31. 65.7
  32. 77200
  33. 24000
  34. 1800
  35. 18000
  36. 2100
  37. 70
  38. 8900
  39. 1700
  40. 20

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