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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 338 · 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 504 × 78? (Round each number first.) (a) 40000 (b) 80000 (c) 4000 (d) 400000
  2. 2.Round 34.87 to one decimal place. =
  3. 3.Which is closest to 402 + 196 + 104? (a) 900 (b) 800 (c) 700 (d) 600
  4. 4.Round 49437 to the nearest ten.
  5. 5.Which is closest to 1995 ÷ 39? (a) 100 (b) 500 (c) 25 (d) 50
  6. 6.Round 34.92 to one decimal place. =
  7. 7.Which is closest to 1507 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300
  8. 8.Which is closest to 804 × 68? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
  9. 9.Which is closest to 703 × 20? (Round each number first.) (a) 14000 (b) 28000 (c) 140000 (d) 1400
  10. 10.Round 37.43 to one decimal place. =
  11. 11.Which is closest to 499 × 31? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  12. 12.Which is closest to 701 + 103 + 497? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  13. 13.Round 11.39 to one decimal place. =
  14. 14.Which is closest to 895 + 96 + 898? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  15. 15.Round 3967 to the nearest ten.
  16. 16.Which is closest to 601 × 78? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  17. 17.Round 40.86 to one decimal place. =
  18. 18.Which is closest to 304 × 38? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  19. 19.Which is closest to 195 + 497 + 397? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  20. 20.Which is closest to 1006 ÷ 49? (a) 20 (b) 10 (c) 200 (d) 40
  21. 21.Which is closest to 199 × 40? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  22. 22.Round 1883 to the nearest ten.
  23. 23.Round 50821 to the nearest ten.
  24. 24.Which is closest to 598 × 18? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  25. 25.Round 38439 to the nearest thousand.
  26. 26.Which is closest to 809 ÷ 41? (a) 20 (b) 200 (c) 40 (d) 10
  27. 27.Which is closest to 2396 ÷ 31? (a) 800 (b) 160 (c) 40 (d) 80
  28. 28.Which is closest to 1591 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  29. 29.Which is closest to 1600 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  30. 30.Which is closest to 396 + 196 + 299? (a) 1000 (b) 900 (c) 800 (d) 1100
  31. 31.Round 94.16 to one decimal place. =
  32. 32.Round 75672 to the nearest ten.
  33. 33.Which is closest to 793 ÷ 19? (a) 400 (b) 20 (c) 80 (d) 40
  34. 34.Which is closest to 2809 ÷ 39? (a) 35 (b) 140 (c) 70 (d) 700
  35. 35.Which is closest to 1207 ÷ 41? (a) 30 (b) 300 (c) 15 (d) 60
  36. 36.Which is closest to 601 ÷ 29? (a) 10 (b) 40 (c) 20 (d) 200
  37. 37.Which is closest to 705 + 104 + 901? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  38. 38.Round 35.37 to one decimal place. =
  39. 39.Which is closest to 2994 ÷ 51? (a) 120 (b) 600 (c) 30 (d) 60
  40. 40.Which is closest to 297 × 62? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000

Answer key

  1. 40000
  2. 34.9
  3. 700
  4. 49440
  5. 50
  6. 34.9
  7. 30
  8. 56000
  9. 14000
  10. 37.4
  11. 15000
  12. 1300
  13. 11.4
  14. 1900
  15. 3970
  16. 48000
  17. 40.9
  18. 12000
  19. 1100
  20. 20
  21. 8000
  22. 1880
  23. 50820
  24. 12000
  25. 38000
  26. 20
  27. 80
  28. 40
  29. 80
  30. 900
  31. 94.2
  32. 75670
  33. 40
  34. 70
  35. 30
  36. 20
  37. 1700
  38. 35.4
  39. 60
  40. 18000

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