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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 67 · 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 35610 to the nearest thousand.
  2. 2.Which is closest to 797 + 603 + 799? (a) 2100 (b) 2200 (c) 2300 (d) 2400
  3. 3.Round 23139 to the nearest hundred.
  4. 4.Which is closest to 196 × 32? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  5. 5.Round 71213 to the nearest ten.
  6. 6.Which is closest to 1503 ÷ 49? (a) 300 (b) 30 (c) 15 (d) 60
  7. 7.Which is closest to 897 × 90? (Round each number first.) (a) 810000 (b) 8100 (c) 81000 (d) 162000
  8. 8.Round 89.48 to one decimal place. =
  9. 9.Round 75.23 to one decimal place. =
  10. 10.Which is closest to 605 + 603 + 900? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  11. 11.Which is closest to 1200 ÷ 31? (a) 40 (b) 400 (c) 80 (d) 20
  12. 12.Which is closest to 1195 ÷ 21? (a) 600 (b) 30 (c) 60 (d) 120
  13. 13.Round 78.87 to one decimal place. =
  14. 14.Which is closest to 903 × 72? (Round each number first.) (a) 63000 (b) 6300 (c) 126000 (d) 630000
  15. 15.Round 28568 to the nearest hundred.
  16. 16.Round 78549 to the nearest ten.
  17. 17.Which is closest to 298 × 50? (Round each number first.) (a) 1500 (b) 15000 (c) 150000 (d) 30000
  18. 18.Which is closest to 198 × 31? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  19. 19.Which is closest to 2707 ÷ 31? (a) 180 (b) 45 (c) 900 (d) 90
  20. 20.Round 4384 to the nearest hundred.
  21. 21.Which is closest to 399 + 698 + 295? (a) 1400 (b) 1500 (c) 1600 (d) 1300
  22. 22.Round 72.84 to one decimal place. =
  23. 23.Which is closest to 300 × 28? (Round each number first.) (a) 900 (b) 90000 (c) 18000 (d) 9000
  24. 24.Round 90.56 to one decimal place. =
  25. 25.Round 75810 to the nearest thousand.
  26. 26.Which is closest to 2796 ÷ 41? (a) 140 (b) 70 (c) 35 (d) 700
  27. 27.Which is closest to 604 × 78? (Round each number first.) (a) 480000 (b) 48000 (c) 96000 (d) 4800
  28. 28.Which is closest to 901 × 18? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  29. 29.Which is closest to 398 × 30? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  30. 30.Which is closest to 197 × 50? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  31. 31.Which is closest to 204 × 19? (Round each number first.) (a) 4000 (b) 40000 (c) 400 (d) 8000
  32. 32.Which is closest to 204 + 604 + 301? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  33. 33.Round 75339 to the nearest ten.
  34. 34.Round 14.91 to one decimal place. =
  35. 35.Round 83.87 to one decimal place. =
  36. 36.Which is closest to 602 × 72? (Round each number first.) (a) 84000 (b) 4200 (c) 420000 (d) 42000
  37. 37.Which is closest to 991 ÷ 21? (a) 25 (b) 100 (c) 50 (d) 500
  38. 38.Which is closest to 201 × 48? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  39. 39.Round 93631 to the nearest ten.
  40. 40.Which is closest to 498 × 50? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000

Answer key

  1. 36000
  2. 2200
  3. 23100
  4. 6000
  5. 71210
  6. 30
  7. 81000
  8. 89.5
  9. 75.2
  10. 2100
  11. 40
  12. 60
  13. 78.9
  14. 63000
  15. 28600
  16. 78550
  17. 15000
  18. 6000
  19. 90
  20. 4400
  21. 1400
  22. 72.8
  23. 9000
  24. 90.6
  25. 76000
  26. 70
  27. 48000
  28. 18000
  29. 12000
  30. 10000
  31. 4000
  32. 1100
  33. 75340
  34. 14.9
  35. 83.9
  36. 42000
  37. 50
  38. 10000
  39. 93630
  40. 25000

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