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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 513 · 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 806 ÷ 39? (a) 10 (b) 20 (c) 200 (d) 40
  2. 2.Which is closest to 1794 ÷ 19? (a) 900 (b) 180 (c) 90 (d) 45
  3. 3.Round 24099 to the nearest thousand.
  4. 4.Which is closest to 498 + 101 + 104? (a) 800 (b) 900 (c) 600 (d) 700
  5. 5.Which is closest to 597 + 98 + 203? (a) 800 (b) 1000 (c) 900 (d) 1100
  6. 6.Which is closest to 402 + 195 + 295? (a) 1100 (b) 1000 (c) 900 (d) 800
  7. 7.Which is closest to 804 + 200 + 603? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  8. 8.Round 75.63 to one decimal place. =
  9. 9.Which is closest to 102 + 801 + 395? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  10. 10.Which is closest to 98 + 95 + 496? (a) 600 (b) 900 (c) 800 (d) 700
  11. 11.Round 98938 to the nearest thousand.
  12. 12.Which is closest to 802 × 19? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  13. 13.Round 59303 to the nearest ten.
  14. 14.Which is closest to 300 × 18? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  15. 15.Which is closest to 198 + 301 + 700? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  16. 16.Round 78084 to the nearest ten.
  17. 17.Round 93.56 to one decimal place. =
  18. 18.Which is closest to 2391 ÷ 29? (a) 40 (b) 80 (c) 800 (d) 160
  19. 19.Round 54.39 to one decimal place. =
  20. 20.Which is closest to 599 ÷ 29? (a) 40 (b) 20 (c) 200 (d) 10
  21. 21.Which is closest to 2406 ÷ 41? (a) 60 (b) 120 (c) 30 (d) 600
  22. 22.Which is closest to 403 × 78? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  23. 23.Which is closest to 1491 ÷ 31? (a) 100 (b) 50 (c) 25 (d) 500
  24. 24.Round 48.71 to one decimal place. =
  25. 25.Round 67455 to the nearest hundred.
  26. 26.Round 73631 to the nearest ten.
  27. 27.Which is closest to 602 + 404 + 299? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  28. 28.Round 10.41 to one decimal place. =
  29. 29.Which is closest to 198 × 30? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  30. 30.Which is closest to 303 × 28? (Round each number first.) (a) 90000 (b) 9000 (c) 900 (d) 18000
  31. 31.Which is closest to 2399 ÷ 29? (a) 160 (b) 80 (c) 800 (d) 40
  32. 32.Round 9006 to the nearest ten.
  33. 33.Which is closest to 196 × 78? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  34. 34.Which is closest to 196 + 202 + 697? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  35. 35.Which is closest to 199 + 204 + 102? (a) 400 (b) 500 (c) 600 (d) 700
  36. 36.Round 13833 to the nearest hundred.
  37. 37.Which is closest to 1607 ÷ 21? (a) 80 (b) 160 (c) 800 (d) 40
  38. 38.Round 41723 to the nearest hundred.
  39. 39.Which is closest to 199 × 38? (Round each number first.) (a) 16000 (b) 8000 (c) 800 (d) 80000
  40. 40.Round 63639 to the nearest thousand.

Answer key

  1. 20
  2. 90
  3. 24000
  4. 700
  5. 900
  6. 900
  7. 1600
  8. 75.6
  9. 1300
  10. 700
  11. 99000
  12. 16000
  13. 59300
  14. 6000
  15. 1200
  16. 78080
  17. 93.6
  18. 80
  19. 54.4
  20. 20
  21. 60
  22. 32000
  23. 50
  24. 48.7
  25. 67500
  26. 73630
  27. 1300
  28. 10.4
  29. 6000
  30. 9000
  31. 80
  32. 9010
  33. 16000
  34. 1100
  35. 500
  36. 13800
  37. 80
  38. 41700
  39. 8000
  40. 64000

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