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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 135 · 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 1004 ÷ 49? (a) 20 (b) 200 (c) 40 (d) 10
  2. 2.Which is closest to 198 × 48? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  3. 3.Which is closest to 300 + 405 + 203? (a) 900 (b) 800 (c) 1100 (d) 1000
  4. 4.Which is closest to 700 × 78? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  5. 5.Round 95951 to the nearest ten.
  6. 6.Which is closest to 297 × 90? (Round each number first.) (a) 2700 (b) 270000 (c) 54000 (d) 27000
  7. 7.Which is closest to 696 × 38? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  8. 8.Round 28.11 to one decimal place. =
  9. 9.Round 90054 to the nearest ten.
  10. 10.Which is closest to 609 ÷ 21? (a) 30 (b) 60 (c) 15 (d) 300
  11. 11.Which is closest to 196 × 79? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  12. 12.Round 38.86 to one decimal place. =
  13. 13.Which is closest to 598 × 49? (Round each number first.) (a) 30000 (b) 3000 (c) 300000 (d) 60000
  14. 14.Which is closest to 603 + 201 + 195? (a) 1100 (b) 1000 (c) 1200 (d) 900
  15. 15.Which is closest to 2400 ÷ 29? (a) 800 (b) 80 (c) 160 (d) 40
  16. 16.Which is closest to 3598 ÷ 41? (a) 90 (b) 180 (c) 900 (d) 45
  17. 17.Which is closest to 202 × 82? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  18. 18.Round 70907 to the nearest thousand.
  19. 19.Which is closest to 2006 ÷ 39? (a) 500 (b) 50 (c) 100 (d) 25
  20. 20.Round 18.92 to one decimal place. =
  21. 21.Which is closest to 198 × 30? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  22. 22.Round 9892 to the nearest ten.
  23. 23.Which is closest to 303 × 22? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  24. 24.Which is closest to 2408 ÷ 31? (a) 80 (b) 40 (c) 160 (d) 800
  25. 25.Round 14.77 to one decimal place. =
  26. 26.Round 78.24 to one decimal place. =
  27. 27.Which is closest to 808 ÷ 21? (a) 400 (b) 20 (c) 40 (d) 80
  28. 28.Round 18723 to the nearest ten.
  29. 29.Round 76809 to the nearest hundred.
  30. 30.Which is closest to 599 × 42? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  31. 31.Round 81.64 to one decimal place. =
  32. 32.Round 13.67 to one decimal place. =
  33. 33.Which is closest to 1200 ÷ 21? (a) 60 (b) 120 (c) 600 (d) 30
  34. 34.Which is closest to 504 + 497 + 400? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  35. 35.Which is closest to 601 ÷ 29? (a) 20 (b) 40 (c) 200 (d) 10
  36. 36.Round 75291 to the nearest thousand.
  37. 37.Which is closest to 904 × 91? (Round each number first.) (a) 162000 (b) 810000 (c) 81000 (d) 8100
  38. 38.Round 15.83 to one decimal place. =
  39. 39.Which is closest to 703 × 32? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  40. 40.Which is closest to 200 × 89? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000

Answer key

  1. 20
  2. 10000
  3. 900
  4. 56000
  5. 95950
  6. 27000
  7. 28000
  8. 28.1
  9. 90050
  10. 30
  11. 16000
  12. 38.9
  13. 30000
  14. 1000
  15. 80
  16. 90
  17. 16000
  18. 71000
  19. 50
  20. 18.9
  21. 6000
  22. 9890
  23. 6000
  24. 80
  25. 14.8
  26. 78.2
  27. 40
  28. 18720
  29. 76800
  30. 24000
  31. 81.6
  32. 13.7
  33. 60
  34. 1400
  35. 20
  36. 75000
  37. 81000
  38. 15.8
  39. 21000
  40. 18000

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