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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 883 · 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 705 + 102 + 105? (a) 1000 (b) 900 (c) 800 (d) 1100
  2. 2.Which is closest to 2404 ÷ 39? (a) 120 (b) 600 (c) 60 (d) 30
  3. 3.Which is closest to 798 + 600 + 97? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  4. 4.Which is closest to 602 ÷ 29? (a) 20 (b) 200 (c) 10 (d) 40
  5. 5.Round 72.86 to one decimal place. =
  6. 6.Which is closest to 900 × 21? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  7. 7.Round 22.61 to one decimal place. =
  8. 8.Round 61193 to the nearest hundred.
  9. 9.Which is closest to 199 + 501 + 504? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  10. 10.Round 13095 to the nearest hundred.
  11. 11.Round 95793 to the nearest hundred.
  12. 12.Which is closest to 801 × 39? (Round each number first.) (a) 3200 (b) 320000 (c) 64000 (d) 32000
  13. 13.Which is closest to 500 × 52? (Round each number first.) (a) 50000 (b) 2500 (c) 25000 (d) 250000
  14. 14.Round 28.39 to one decimal place. =
  15. 15.Round 42.06 to one decimal place. =
  16. 16.Which is closest to 301 + 795 + 198? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  17. 17.Which is closest to 900 × 49? (Round each number first.) (a) 45000 (b) 4500 (c) 450000 (d) 90000
  18. 18.Round 66310 to the nearest thousand.
  19. 19.Which is closest to 596 × 19? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  20. 20.Which is closest to 604 × 62? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  21. 21.Round 19451 to the nearest ten.
  22. 22.Which is closest to 2401 ÷ 29? (a) 80 (b) 800 (c) 40 (d) 160
  23. 23.Which is closest to 405 + 895 + 802? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  24. 24.Which is closest to 697 × 18? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  25. 25.Which is closest to 501 + 504 + 203? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  26. 26.Which is closest to 296 + 798 + 795? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  27. 27.Which is closest to 496 + 396 + 199? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  28. 28.Round 50.62 to one decimal place. =
  29. 29.Round 36.48 to one decimal place. =
  30. 30.Round 19.31 to one decimal place. =
  31. 31.Round 24788 to the nearest ten.
  32. 32.Which is closest to 695 + 695 + 802? (a) 2200 (b) 2100 (c) 2300 (d) 2400
  33. 33.Round 4342 to the nearest hundred.
  34. 34.Round 66.32 to one decimal place. =
  35. 35.Round 46.12 to one decimal place. =
  36. 36.Which is closest to 2699 ÷ 31? (a) 180 (b) 900 (c) 45 (d) 90
  37. 37.Which is closest to 1795 ÷ 21? (a) 45 (b) 90 (c) 180 (d) 900
  38. 38.Round 28.76 to one decimal place. =
  39. 39.Round 43341 to the nearest ten.
  40. 40.Round 13855 to the nearest thousand.

Answer key

  1. 900
  2. 60
  3. 1500
  4. 20
  5. 72.9
  6. 18000
  7. 22.6
  8. 61200
  9. 1200
  10. 13100
  11. 95800
  12. 32000
  13. 25000
  14. 28.4
  15. 42.1
  16. 1300
  17. 45000
  18. 66000
  19. 12000
  20. 36000
  21. 19450
  22. 80
  23. 2100
  24. 14000
  25. 1200
  26. 1900
  27. 1100
  28. 50.6
  29. 36.5
  30. 19.3
  31. 24790
  32. 2200
  33. 4300
  34. 66.3
  35. 46.1
  36. 90
  37. 90
  38. 28.8
  39. 43340
  40. 14000

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