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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 561 · 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 80.36 to one decimal place. =
  2. 2.Which is closest to 3204 ÷ 39? (a) 800 (b) 40 (c) 160 (d) 80
  3. 3.Which is closest to 100 + 203 + 204? (a) 700 (b) 500 (c) 400 (d) 600
  4. 4.Which is closest to 4003 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  5. 5.Round 76658 to the nearest ten.
  6. 6.Which is closest to 901 × 79? (Round each number first.) (a) 144000 (b) 72000 (c) 7200 (d) 720000
  7. 7.Which is closest to 398 × 60? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  8. 8.Which is closest to 1809 ÷ 19? (a) 180 (b) 900 (c) 90 (d) 45
  9. 9.Which is closest to 700 + 298 + 402? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  10. 10.Which is closest to 3602 ÷ 41? (a) 90 (b) 180 (c) 900 (d) 45
  11. 11.Round 40257 to the nearest thousand.
  12. 12.Which is closest to 503 + 296 + 897? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  13. 13.Which is closest to 909 ÷ 29? (a) 15 (b) 300 (c) 60 (d) 30
  14. 14.Which is closest to 800 + 303 + 205? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  15. 15.Round 45011 to the nearest hundred.
  16. 16.Which is closest to 1005 ÷ 19? (a) 500 (b) 25 (c) 100 (d) 50
  17. 17.Which is closest to 398 × 82? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  18. 18.Which is closest to 403 × 40? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  19. 19.Which is closest to 1196 ÷ 21? (a) 120 (b) 30 (c) 60 (d) 600
  20. 20.Which is closest to 1199 ÷ 19? (a) 120 (b) 600 (c) 60 (d) 30
  21. 21.Which is closest to 296 × 80? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  22. 22.Round 67938 to the nearest ten.
  23. 23.Which is closest to 598 × 22? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  24. 24.Which is closest to 901 + 699 + 299? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  25. 25.Which is closest to 2703 ÷ 29? (a) 180 (b) 45 (c) 900 (d) 90
  26. 26.Which is closest to 1192 ÷ 31? (a) 80 (b) 20 (c) 40 (d) 400
  27. 27.Which is closest to 298 + 802 + 402? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  28. 28.Which is closest to 300 + 99 + 703? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  29. 29.Which is closest to 503 + 96 + 501? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  30. 30.Which is closest to 600 × 39? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  31. 31.Round 64.62 to one decimal place. =
  32. 32.Which is closest to 600 + 100 + 403? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  33. 33.Round 24.37 to one decimal place. =
  34. 34.Which is closest to 399 × 89? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  35. 35.Round 15.68 to one decimal place. =
  36. 36.Which is closest to 104 + 405 + 398? (a) 1000 (b) 800 (c) 900 (d) 1100
  37. 37.Round 54408 to the nearest hundred.
  38. 38.Round 87.09 to one decimal place. =
  39. 39.Which is closest to 905 + 298 + 197? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  40. 40.Which is closest to 296 × 41? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000

Answer key

  1. 80.4
  2. 80
  3. 500
  4. 80
  5. 76660
  6. 72000
  7. 24000
  8. 90
  9. 1400
  10. 90
  11. 40000
  12. 1700
  13. 30
  14. 1300
  15. 45000
  16. 50
  17. 32000
  18. 16000
  19. 60
  20. 60
  21. 24000
  22. 67940
  23. 12000
  24. 1900
  25. 90
  26. 40
  27. 1500
  28. 1100
  29. 1100
  30. 24000
  31. 64.6
  32. 1100
  33. 24.4
  34. 36000
  35. 15.7
  36. 900
  37. 54400
  38. 87.1
  39. 1400
  40. 12000

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