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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 906 · 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 3194 ÷ 41? (a) 800 (b) 80 (c) 40 (d) 160
  2. 2.Which is closest to 200 × 78? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  3. 3.Which is closest to 203 + 501 + 898? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  4. 4.Round 95.09 to one decimal place. =
  5. 5.Round 78.94 to one decimal place. =
  6. 6.Round 14734 to the nearest hundred.
  7. 7.Round 16.07 to one decimal place. =
  8. 8.Which is closest to 196 × 78? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  9. 9.Which is closest to 404 × 28? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  10. 10.Round 42.26 to one decimal place. =
  11. 11.Which is closest to 299 × 61? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  12. 12.Which is closest to 1506 ÷ 29? (a) 500 (b) 50 (c) 100 (d) 25
  13. 13.Round 30753 to the nearest hundred.
  14. 14.Which is closest to 398 ÷ 19? (a) 40 (b) 20 (c) 200 (d) 10
  15. 15.Which is closest to 400 + 799 + 101? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  16. 16.Which is closest to 804 × 88? (Round each number first.) (a) 7200 (b) 72000 (c) 144000 (d) 720000
  17. 17.Round 78617 to the nearest thousand.
  18. 18.Which is closest to 2404 ÷ 31? (a) 80 (b) 40 (c) 160 (d) 800
  19. 19.Which is closest to 503 × 31? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  20. 20.Round 71.66 to one decimal place. =
  21. 21.Which is closest to 497 × 29? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
  22. 22.Which is closest to 4501 ÷ 49? (a) 180 (b) 90 (c) 45 (d) 900
  23. 23.Which is closest to 603 × 89? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  24. 24.Round 52.18 to one decimal place. =
  25. 25.Which is closest to 1201 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  26. 26.Round 49458 to the nearest hundred.
  27. 27.Round 58.52 to one decimal place. =
  28. 28.Round 78366 to the nearest ten.
  29. 29.Round 16.14 to one decimal place. =
  30. 30.Round 35126 to the nearest ten.
  31. 31.Round 15.89 to one decimal place. =
  32. 32.Which is closest to 898 × 58? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  33. 33.Which is closest to 200 + 299 + 495? (a) 900 (b) 1100 (c) 1200 (d) 1000
  34. 34.Round 7505 to the nearest hundred.
  35. 35.Which is closest to 4495 ÷ 49? (a) 90 (b) 45 (c) 900 (d) 180
  36. 36.Which is closest to 801 ÷ 21? (a) 40 (b) 20 (c) 80 (d) 400
  37. 37.Which is closest to 203 × 61? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  38. 38.Round 74.29 to one decimal place. =
  39. 39.Which is closest to 696 × 80? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  40. 40.Round 80.43 to one decimal place. =

Answer key

  1. 80
  2. 16000
  3. 1600
  4. 95.1
  5. 78.9
  6. 14700
  7. 16.1
  8. 16000
  9. 12000
  10. 42.3
  11. 18000
  12. 50
  13. 30800
  14. 20
  15. 1300
  16. 72000
  17. 79000
  18. 80
  19. 15000
  20. 71.7
  21. 15000
  22. 90
  23. 54000
  24. 52.2
  25. 60
  26. 49500
  27. 58.5
  28. 78370
  29. 16.1
  30. 35130
  31. 15.9
  32. 54000
  33. 1000
  34. 7500
  35. 90
  36. 40
  37. 12000
  38. 74.3
  39. 56000
  40. 80.4

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