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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 773 · 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 404 + 503 + 698? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  2. 2.Round 3209 to the nearest ten.
  3. 3.Round 30.28 to one decimal place. =
  4. 4.Which is closest to 599 + 199 + 597? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  5. 5.Which is closest to 999 ÷ 21? (a) 50 (b) 25 (c) 100 (d) 500
  6. 6.Round 93057 to the nearest ten.
  7. 7.Which is closest to 904 + 505 + 697? (a) 2300 (b) 2100 (c) 2000 (d) 2200
  8. 8.Round 83727 to the nearest ten.
  9. 9.Which is closest to 1608 ÷ 41? (a) 400 (b) 40 (c) 20 (d) 80
  10. 10.Which is closest to 1196 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  11. 11.Which is closest to 2501 ÷ 49? (a) 500 (b) 50 (c) 25 (d) 100
  12. 12.Which is closest to 2503 ÷ 51? (a) 25 (b) 500 (c) 50 (d) 100
  13. 13.Which is closest to 500 + 601 + 300? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  14. 14.Round 36216 to the nearest ten.
  15. 15.Round 17.52 to one decimal place. =
  16. 16.Round 16.17 to one decimal place. =
  17. 17.Which is closest to 296 × 22? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  18. 18.Round 30.52 to one decimal place. =
  19. 19.Which is closest to 3603 ÷ 41? (a) 900 (b) 45 (c) 180 (d) 90
  20. 20.Which is closest to 1201 ÷ 19? (a) 600 (b) 60 (c) 120 (d) 30
  21. 21.Which is closest to 701 + 804 + 805? (a) 2200 (b) 2300 (c) 2500 (d) 2400
  22. 22.Which is closest to 1004 ÷ 49? (a) 200 (b) 40 (c) 20 (d) 10
  23. 23.Which is closest to 4506 ÷ 51? (a) 90 (b) 45 (c) 180 (d) 900
  24. 24.Which is closest to 198 × 31? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  25. 25.Which is closest to 797 × 81? (Round each number first.) (a) 64000 (b) 128000 (c) 6400 (d) 640000
  26. 26.Which is closest to 897 + 101 + 200? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  27. 27.Which is closest to 701 + 404 + 801? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  28. 28.Which is closest to 696 × 38? (Round each number first.) (a) 28000 (b) 280000 (c) 56000 (d) 2800
  29. 29.Which is closest to 898 × 92? (Round each number first.) (a) 162000 (b) 810000 (c) 8100 (d) 81000
  30. 30.Which is closest to 901 × 50? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  31. 31.Round 45.32 to one decimal place. =
  32. 32.Round 79114 to the nearest thousand.
  33. 33.Round 55.21 to one decimal place. =
  34. 34.Round 31890 to the nearest hundred.
  35. 35.Which is closest to 1195 ÷ 39? (a) 300 (b) 60 (c) 15 (d) 30
  36. 36.Which is closest to 601 × 22? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  37. 37.Round 38.46 to one decimal place. =
  38. 38.Which is closest to 397 × 20? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  39. 39.Which is closest to 698 × 51? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  40. 40.Which is closest to 804 × 31? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000

Answer key

  1. 1600
  2. 3210
  3. 30.3
  4. 1400
  5. 50
  6. 93060
  7. 2100
  8. 83730
  9. 40
  10. 60
  11. 50
  12. 50
  13. 1400
  14. 36220
  15. 17.5
  16. 16.2
  17. 6000
  18. 30.5
  19. 90
  20. 60
  21. 2300
  22. 20
  23. 90
  24. 6000
  25. 64000
  26. 1200
  27. 1900
  28. 28000
  29. 81000
  30. 45000
  31. 45.3
  32. 79000
  33. 55.2
  34. 31900
  35. 30
  36. 12000
  37. 38.5
  38. 8000
  39. 35000
  40. 24000

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