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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 254 · 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 802 + 295 + 205? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  2. 2.Round 11.71 to one decimal place. =
  3. 3.Which is closest to 801 ÷ 39? (a) 200 (b) 40 (c) 20 (d) 10
  4. 4.Which is closest to 298 + 195 + 503? (a) 1200 (b) 1100 (c) 1000 (d) 900
  5. 5.Which is closest to 300 × 69? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  6. 6.Round 13.28 to one decimal place. =
  7. 7.Which is closest to 804 × 50? (Round each number first.) (a) 40000 (b) 400000 (c) 80000 (d) 4000
  8. 8.Which is closest to 800 + 803 + 200? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  9. 9.Which is closest to 4000 ÷ 49? (a) 40 (b) 160 (c) 80 (d) 800
  10. 10.Which is closest to 601 + 497 + 98? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  11. 11.Round 99583 to the nearest ten.
  12. 12.Round 5369 to the nearest ten.
  13. 13.Round 74387 to the nearest thousand.
  14. 14.Which is closest to 697 × 40? (Round each number first.) (a) 280000 (b) 2800 (c) 28000 (d) 56000
  15. 15.Which is closest to 601 + 900 + 495? (a) 1900 (b) 2000 (c) 2100 (d) 2200
  16. 16.Round 32893 to the nearest hundred.
  17. 17.Which is closest to 1603 ÷ 39? (a) 80 (b) 40 (c) 20 (d) 400
  18. 18.Which is closest to 503 × 21? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  19. 19.Which is closest to 2008 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  20. 20.Which is closest to 2691 ÷ 29? (a) 900 (b) 90 (c) 180 (d) 45
  21. 21.Which is closest to 404 ÷ 19? (a) 10 (b) 200 (c) 40 (d) 20
  22. 22.Round 64596 to the nearest thousand.
  23. 23.Which is closest to 196 × 62? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  24. 24.Which is closest to 1194 ÷ 21? (a) 600 (b) 30 (c) 120 (d) 60
  25. 25.Round 54369 to the nearest thousand.
  26. 26.Round 38970 to the nearest thousand.
  27. 27.Round 35.19 to one decimal place. =
  28. 28.Which is closest to 400 + 296 + 196? (a) 800 (b) 900 (c) 1000 (d) 1100
  29. 29.Round 13211 to the nearest ten.
  30. 30.Round 70.09 to one decimal place. =
  31. 31.Round 25210 to the nearest hundred.
  32. 32.Which is closest to 403 + 298 + 805? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  33. 33.Which is closest to 696 + 296 + 297? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  34. 34.Which is closest to 601 × 42? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  35. 35.Which is closest to 800 + 402 + 302? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  36. 36.Round 97.13 to one decimal place. =
  37. 37.Round 29.41 to one decimal place. =
  38. 38.Round 76.24 to one decimal place. =
  39. 39.Round 16.43 to one decimal place. =
  40. 40.Round 29659 to the nearest thousand.

Answer key

  1. 1300
  2. 11.7
  3. 20
  4. 1000
  5. 21000
  6. 13.3
  7. 40000
  8. 1800
  9. 80
  10. 1200
  11. 99580
  12. 5370
  13. 74000
  14. 28000
  15. 2000
  16. 32900
  17. 40
  18. 10000
  19. 50
  20. 90
  21. 20
  22. 65000
  23. 12000
  24. 60
  25. 54000
  26. 39000
  27. 35.2
  28. 900
  29. 13210
  30. 70.1
  31. 25200
  32. 1500
  33. 1300
  34. 24000
  35. 1500
  36. 97.1
  37. 29.4
  38. 76.2
  39. 16.4
  40. 30000

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