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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 69 · 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 16.52 to one decimal place. =
  2. 2.Round 82.81 to one decimal place. =
  3. 3.Which is closest to 501 + 500 + 202? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  4. 4.Which is closest to 799 × 49? (Round each number first.) (a) 80000 (b) 4000 (c) 40000 (d) 400000
  5. 5.Which is closest to 301 × 22? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  6. 6.Round 54364 to the nearest ten.
  7. 7.Round 20470 to the nearest hundred.
  8. 8.Round 18318 to the nearest thousand.
  9. 9.Which is closest to 900 ÷ 31? (a) 300 (b) 15 (c) 60 (d) 30
  10. 10.Round 11.43 to one decimal place. =
  11. 11.Which is closest to 496 + 895 + 696? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  12. 12.Which is closest to 800 + 805 + 296? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  13. 13.Which is closest to 905 ÷ 31? (a) 15 (b) 300 (c) 60 (d) 30
  14. 14.Round 60.17 to one decimal place. =
  15. 15.Which is closest to 699 × 40? (Round each number first.) (a) 2800 (b) 280000 (c) 28000 (d) 56000
  16. 16.Which is closest to 196 × 32? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  17. 17.Round 14.17 to one decimal place. =
  18. 18.Round 72.33 to one decimal place. =
  19. 19.Which is closest to 1205 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
  20. 20.Round 93.89 to one decimal place. =
  21. 21.Which is closest to 597 + 598 + 898? (a) 2100 (b) 2200 (c) 2300 (d) 2000
  22. 22.Which is closest to 196 × 19? (Round each number first.) (a) 40000 (b) 4000 (c) 400 (d) 8000
  23. 23.Which is closest to 2693 ÷ 29? (a) 180 (b) 900 (c) 45 (d) 90
  24. 24.Round 34.12 to one decimal place. =
  25. 25.Round 99413 to the nearest hundred.
  26. 26.Round 83.72 to one decimal place. =
  27. 27.Which is closest to 202 × 89? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  28. 28.Which is closest to 396 × 31? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  29. 29.Round 86.53 to one decimal place. =
  30. 30.Which is closest to 297 × 52? (Round each number first.) (a) 15000 (b) 150000 (c) 1500 (d) 30000
  31. 31.Which is closest to 698 × 78? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  32. 32.Round 92456 to the nearest hundred.
  33. 33.Which is closest to 803 × 38? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
  34. 34.Round 44019 to the nearest ten.
  35. 35.Round 40700 to the nearest thousand.
  36. 36.Round 3670 to the nearest thousand.
  37. 37.Which is closest to 405 + 496 + 199? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  38. 38.Which is closest to 4005 ÷ 51? (a) 160 (b) 40 (c) 800 (d) 80
  39. 39.Which is closest to 197 × 91? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  40. 40.Which is closest to 296 × 22? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000

Answer key

  1. 16.5
  2. 82.8
  3. 1200
  4. 40000
  5. 6000
  6. 54360
  7. 20500
  8. 18000
  9. 30
  10. 11.4
  11. 2100
  12. 1900
  13. 30
  14. 60.2
  15. 28000
  16. 6000
  17. 14.2
  18. 72.3
  19. 40
  20. 93.9
  21. 2100
  22. 4000
  23. 90
  24. 34.1
  25. 99400
  26. 83.7
  27. 18000
  28. 12000
  29. 86.5
  30. 15000
  31. 56000
  32. 92500
  33. 32000
  34. 44020
  35. 41000
  36. 4000
  37. 1100
  38. 80
  39. 18000
  40. 6000

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