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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 158 · 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 397 × 38? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  2. 2.Which is closest to 805 ÷ 21? (a) 80 (b) 400 (c) 20 (d) 40
  3. 3.Round 33.47 to one decimal place. =
  4. 4.Round 29072 to the nearest thousand.
  5. 5.Which is closest to 405 ÷ 21? (a) 10 (b) 40 (c) 200 (d) 20
  6. 6.Which is closest to 201 × 32? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  7. 7.Which is closest to 802 × 22? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  8. 8.Round 75.57 to one decimal place. =
  9. 9.Which is closest to 301 × 90? (Round each number first.) (a) 27000 (b) 270000 (c) 2700 (d) 54000
  10. 10.Which is closest to 900 × 22? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  11. 11.Which is closest to 3006 ÷ 49? (a) 30 (b) 60 (c) 600 (d) 120
  12. 12.Which is closest to 403 × 41? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  13. 13.Round 22463 to the nearest ten.
  14. 14.Which is closest to 704 × 79? (Round each number first.) (a) 112000 (b) 56000 (c) 5600 (d) 560000
  15. 15.Which is closest to 1799 ÷ 21? (a) 180 (b) 45 (c) 90 (d) 900
  16. 16.Round 3913 to the nearest thousand.
  17. 17.Which is closest to 2007 ÷ 51? (a) 40 (b) 80 (c) 400 (d) 20
  18. 18.Which is closest to 796 × 78? (Round each number first.) (a) 640000 (b) 128000 (c) 6400 (d) 64000
  19. 19.Round 88090 to the nearest thousand.
  20. 20.Which is closest to 197 × 30? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  21. 21.Which is closest to 198 × 32? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  22. 22.Which is closest to 806 ÷ 41? (a) 200 (b) 10 (c) 20 (d) 40
  23. 23.Which is closest to 405 + 799 + 403? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  24. 24.Which is closest to 205 + 102 + 96? (a) 400 (b) 600 (c) 300 (d) 500
  25. 25.Round 12.34 to one decimal place. =
  26. 26.Round 87.29 to one decimal place. =
  27. 27.Which is closest to 303 × 42? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  28. 28.Which is closest to 496 × 61? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  29. 29.Round 54.08 to one decimal place. =
  30. 30.Round 94.29 to one decimal place. =
  31. 31.Which is closest to 2491 ÷ 51? (a) 500 (b) 50 (c) 25 (d) 100
  32. 32.Which is closest to 1494 ÷ 51? (a) 15 (b) 300 (c) 30 (d) 60
  33. 33.Which is closest to 205 + 302 + 196? (a) 600 (b) 800 (c) 900 (d) 700
  34. 34.Which is closest to 703 + 895 + 796? (a) 2400 (b) 2500 (c) 2300 (d) 2600
  35. 35.Round 33136 to the nearest ten.
  36. 36.Which is closest to 604 + 299 + 200? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  37. 37.Which is closest to 296 × 40? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  38. 38.Round 26821 to the nearest ten.
  39. 39.Round 63.67 to one decimal place. =
  40. 40.Round 69.26 to one decimal place. =

Answer key

  1. 16000
  2. 40
  3. 33.5
  4. 29000
  5. 20
  6. 6000
  7. 16000
  8. 75.6
  9. 27000
  10. 18000
  11. 60
  12. 16000
  13. 22460
  14. 56000
  15. 90
  16. 4000
  17. 40
  18. 64000
  19. 88000
  20. 6000
  21. 6000
  22. 20
  23. 1600
  24. 400
  25. 12.3
  26. 87.3
  27. 12000
  28. 30000
  29. 54.1
  30. 94.3
  31. 50
  32. 30
  33. 700
  34. 2400
  35. 33140
  36. 1100
  37. 12000
  38. 26820
  39. 63.7
  40. 69.3

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