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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 347 · 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 195 + 298 + 798? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  2. 2.Which is closest to 798 + 605 + 497? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  3. 3.Which is closest to 4501 ÷ 49? (a) 180 (b) 90 (c) 900 (d) 45
  4. 4.Which is closest to 196 × 20? (Round each number first.) (a) 400 (b) 4000 (c) 8000 (d) 40000
  5. 5.Round 19477 to the nearest thousand.
  6. 6.Which is closest to 504 × 80? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  7. 7.Round 53.12 to one decimal place. =
  8. 8.Which is closest to 203 × 92? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  9. 9.Round 38998 to the nearest thousand.
  10. 10.Which is closest to 396 × 71? (Round each number first.) (a) 280000 (b) 28000 (c) 56000 (d) 2800
  11. 11.Which is closest to 1808 ÷ 21? (a) 180 (b) 90 (c) 45 (d) 900
  12. 12.Which is closest to 198 × 48? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  13. 13.Which is closest to 803 + 497 + 697? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  14. 14.Which is closest to 300 × 21? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  15. 15.Round 44.36 to one decimal place. =
  16. 16.Round 79208 to the nearest ten.
  17. 17.Round 17.43 to one decimal place. =
  18. 18.Which is closest to 302 + 400 + 403? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  19. 19.Which is closest to 1795 ÷ 19? (a) 45 (b) 900 (c) 90 (d) 180
  20. 20.Round 41868 to the nearest ten.
  21. 21.Round 62261 to the nearest hundred.
  22. 22.Round 89634 to the nearest ten.
  23. 23.Which is closest to 2704 ÷ 29? (a) 180 (b) 45 (c) 90 (d) 900
  24. 24.Which is closest to 899 × 59? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  25. 25.Round 45847 to the nearest ten.
  26. 26.Which is closest to 705 + 95 + 897? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  27. 27.Round 21.23 to one decimal place. =
  28. 28.Round 89296 to the nearest hundred.
  29. 29.Which is closest to 1606 ÷ 41? (a) 40 (b) 80 (c) 400 (d) 20
  30. 30.Which is closest to 3992 ÷ 51? (a) 160 (b) 40 (c) 800 (d) 80
  31. 31.Which is closest to 199 × 81? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
  32. 32.Round 3082 to the nearest thousand.
  33. 33.Which is closest to 1193 ÷ 41? (a) 30 (b) 300 (c) 15 (d) 60
  34. 34.Which is closest to 197 × 41? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  35. 35.Which is closest to 798 × 30? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  36. 36.Round 89.44 to one decimal place. =
  37. 37.Round 47.17 to one decimal place. =
  38. 38.Which is closest to 1203 ÷ 19? (a) 600 (b) 120 (c) 60 (d) 30
  39. 39.Which is closest to 505 + 703 + 204? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  40. 40.Which is closest to 1808 ÷ 29? (a) 600 (b) 30 (c) 120 (d) 60

Answer key

  1. 1300
  2. 1900
  3. 90
  4. 4000
  5. 19000
  6. 40000
  7. 53.1
  8. 18000
  9. 39000
  10. 28000
  11. 90
  12. 10000
  13. 2000
  14. 6000
  15. 44.4
  16. 79210
  17. 17.4
  18. 1100
  19. 90
  20. 41870
  21. 62300
  22. 89630
  23. 90
  24. 54000
  25. 45850
  26. 1700
  27. 21.2
  28. 89300
  29. 40
  30. 80
  31. 16000
  32. 3000
  33. 30
  34. 8000
  35. 24000
  36. 89.4
  37. 47.2
  38. 60
  39. 1400
  40. 60

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