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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 737 · 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.Round 24803 to the nearest hundred.
  2. 2.Which is closest to 896 × 88? (Round each number first.) (a) 810000 (b) 81000 (c) 8100 (d) 162000
  3. 3.Which is closest to 400 × 81? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  4. 4.Round 33.24 to one decimal place. =
  5. 5.Round 49.66 to one decimal place. =
  6. 6.Which is closest to 504 × 21? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  7. 7.Which is closest to 795 + 800 + 496? (a) 2300 (b) 2000 (c) 2200 (d) 2100
  8. 8.Which is closest to 996 ÷ 19? (a) 25 (b) 500 (c) 100 (d) 50
  9. 9.Round 72889 to the nearest thousand.
  10. 10.Which is closest to 399 × 88? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  11. 11.Round 31083 to the nearest hundred.
  12. 12.Round 73.53 to one decimal place. =
  13. 13.Which is closest to 497 + 497 + 397? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  14. 14.Which is closest to 500 + 196 + 502? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  15. 15.Which is closest to 2395 ÷ 29? (a) 800 (b) 160 (c) 80 (d) 40
  16. 16.Which is closest to 203 + 305 + 305? (a) 700 (b) 800 (c) 900 (d) 1000
  17. 17.Round 62.86 to one decimal place. =
  18. 18.Which is closest to 795 + 699 + 795? (a) 2400 (b) 2200 (c) 2300 (d) 2500
  19. 19.Which is closest to 392 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
  20. 20.Which is closest to 901 × 39? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  21. 21.Round 13.19 to one decimal place. =
  22. 22.Which is closest to 297 × 80? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  23. 23.Which is closest to 305 + 399 + 699? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  24. 24.Round 42.24 to one decimal place. =
  25. 25.Round 46.81 to one decimal place. =
  26. 26.Which is closest to 800 + 598 + 402? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  27. 27.Which is closest to 200 × 29? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  28. 28.Round 1635 to the nearest hundred.
  29. 29.Round 20.14 to one decimal place. =
  30. 30.Which is closest to 797 × 80? (Round each number first.) (a) 64000 (b) 640000 (c) 6400 (d) 128000
  31. 31.Which is closest to 899 × 92? (Round each number first.) (a) 810000 (b) 162000 (c) 81000 (d) 8100
  32. 32.Which is closest to 604 × 41? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  33. 33.Which is closest to 705 + 899 + 298? (a) 2000 (b) 1900 (c) 2100 (d) 1800
  34. 34.Round 93687 to the nearest hundred.
  35. 35.Round 77531 to the nearest ten.
  36. 36.Which is closest to 400 ÷ 19? (a) 20 (b) 200 (c) 40 (d) 10
  37. 37.Which is closest to 3494 ÷ 51? (a) 140 (b) 700 (c) 35 (d) 70
  38. 38.Round 67136 to the nearest ten.
  39. 39.Round 46256 to the nearest ten.
  40. 40.Which is closest to 2005 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50

Answer key

  1. 24800
  2. 81000
  3. 32000
  4. 33.2
  5. 49.7
  6. 10000
  7. 2100
  8. 50
  9. 73000
  10. 36000
  11. 31100
  12. 73.5
  13. 1400
  14. 1200
  15. 80
  16. 800
  17. 62.9
  18. 2300
  19. 20
  20. 36000
  21. 13.2
  22. 24000
  23. 1400
  24. 42.2
  25. 46.8
  26. 1800
  27. 6000
  28. 1600
  29. 20.1
  30. 64000
  31. 81000
  32. 24000
  33. 1900
  34. 93700
  35. 77530
  36. 20
  37. 70
  38. 67140
  39. 46260
  40. 50

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