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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 840 · 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 31074 to the nearest ten.
  2. 2.Which is closest to 300 × 79? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  3. 3.Round 16.52 to one decimal place. =
  4. 4.Round 27.28 to one decimal place. =
  5. 5.Which is closest to 297 + 599 + 395? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  6. 6.Which is closest to 704 × 72? (Round each number first.) (a) 98000 (b) 490000 (c) 49000 (d) 4900
  7. 7.Which is closest to 2495 ÷ 49? (a) 500 (b) 25 (c) 100 (d) 50
  8. 8.Round 15.38 to one decimal place. =
  9. 9.Which is closest to 609 ÷ 21? (a) 30 (b) 300 (c) 60 (d) 15
  10. 10.Round 45.34 to one decimal place. =
  11. 11.Round 11.46 to one decimal place. =
  12. 12.Round 53218 to the nearest thousand.
  13. 13.Round 7995 to the nearest thousand.
  14. 14.Which is closest to 203 × 31? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  15. 15.Round 52901 to the nearest ten.
  16. 16.Which is closest to 1202 ÷ 21? (a) 600 (b) 60 (c) 30 (d) 120
  17. 17.Which is closest to 4495 ÷ 51? (a) 90 (b) 180 (c) 900 (d) 45
  18. 18.Which is closest to 499 × 82? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  19. 19.Which is closest to 404 × 20? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  20. 20.Which is closest to 401 × 51? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  21. 21.Round 76.56 to one decimal place. =
  22. 22.Which is closest to 501 × 62? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
  23. 23.Round 88.76 to one decimal place. =
  24. 24.Which is closest to 198 × 52? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
  25. 25.Which is closest to 301 + 498 + 495? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  26. 26.Which is closest to 1799 ÷ 19? (a) 900 (b) 180 (c) 90 (d) 45
  27. 27.Round 92.12 to one decimal place. =
  28. 28.Which is closest to 405 + 705 + 100? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  29. 29.Which is closest to 301 × 68? (Round each number first.) (a) 21000 (b) 2100 (c) 210000 (d) 42000
  30. 30.Which is closest to 795 ÷ 41? (a) 20 (b) 200 (c) 40 (d) 10
  31. 31.Which is closest to 103 + 604 + 103? (a) 700 (b) 900 (c) 1000 (d) 800
  32. 32.Round 27129 to the nearest hundred.
  33. 33.Which is closest to 1501 ÷ 29? (a) 500 (b) 25 (c) 100 (d) 50
  34. 34.Which is closest to 4501 ÷ 51? (a) 180 (b) 900 (c) 90 (d) 45
  35. 35.Round 89902 to the nearest thousand.
  36. 36.Which is closest to 2806 ÷ 39? (a) 35 (b) 70 (c) 140 (d) 700
  37. 37.Round 1168 to the nearest ten.
  38. 38.Which is closest to 404 × 78? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  39. 39.Which is closest to 603 × 19? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  40. 40.Round 30241 to the nearest hundred.

Answer key

  1. 31070
  2. 24000
  3. 16.5
  4. 27.3
  5. 1300
  6. 49000
  7. 50
  8. 15.4
  9. 30
  10. 45.3
  11. 11.5
  12. 53000
  13. 8000
  14. 6000
  15. 52900
  16. 60
  17. 90
  18. 40000
  19. 8000
  20. 20000
  21. 76.6
  22. 30000
  23. 88.8
  24. 10000
  25. 1300
  26. 90
  27. 92.1
  28. 1200
  29. 21000
  30. 20
  31. 800
  32. 27100
  33. 50
  34. 90
  35. 90000
  36. 70
  37. 1170
  38. 32000
  39. 12000
  40. 30200

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