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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 715 · 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 802 + 96 + 598? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  2. 2.Round 90730 to the nearest hundred.
  3. 3.Which is closest to 1803 ÷ 19? (a) 900 (b) 45 (c) 90 (d) 180
  4. 4.Which is closest to 401 × 28? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  5. 5.Which is closest to 1195 ÷ 19? (a) 30 (b) 60 (c) 120 (d) 600
  6. 6.Which is closest to 598 + 195 + 305? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  7. 7.Which is closest to 1193 ÷ 21? (a) 60 (b) 30 (c) 600 (d) 120
  8. 8.Round 16.63 to one decimal place. =
  9. 9.Round 13671 to the nearest thousand.
  10. 10.Which is closest to 499 × 48? (Round each number first.) (a) 25000 (b) 50000 (c) 250000 (d) 2500
  11. 11.Which is closest to 699 × 70? (Round each number first.) (a) 98000 (b) 4900 (c) 49000 (d) 490000
  12. 12.Which is closest to 2093 ÷ 31? (a) 70 (b) 35 (c) 140 (d) 700
  13. 13.Which is closest to 200 × 21? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  14. 14.Round 74.08 to one decimal place. =
  15. 15.Round 70958 to the nearest hundred.
  16. 16.Round 89905 to the nearest hundred.
  17. 17.Which is closest to 596 × 79? (Round each number first.) (a) 480000 (b) 48000 (c) 96000 (d) 4800
  18. 18.Which is closest to 904 × 88? (Round each number first.) (a) 8100 (b) 810000 (c) 81000 (d) 162000
  19. 19.Which is closest to 803 × 59? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  20. 20.Which is closest to 497 × 18? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  21. 21.Which is closest to 299 + 704 + 98? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  22. 22.Which is closest to 1994 ÷ 49? (a) 20 (b) 40 (c) 80 (d) 400
  23. 23.Which is closest to 695 + 601 + 96? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  24. 24.Which is closest to 1991 ÷ 49? (a) 80 (b) 40 (c) 400 (d) 20
  25. 25.Round 52.23 to one decimal place. =
  26. 26.Round 15.34 to one decimal place. =
  27. 27.Which is closest to 401 × 71? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  28. 28.Round 96.32 to one decimal place. =
  29. 29.Round 57096 to the nearest hundred.
  30. 30.Which is closest to 1992 ÷ 51? (a) 400 (b) 40 (c) 20 (d) 80
  31. 31.Round 16.69 to one decimal place. =
  32. 32.Which is closest to 496 × 48? (Round each number first.) (a) 50000 (b) 250000 (c) 25000 (d) 2500
  33. 33.Which is closest to 1498 ÷ 51? (a) 30 (b) 15 (c) 60 (d) 300
  34. 34.Which is closest to 597 × 72? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  35. 35.Which is closest to 99 + 700 + 195? (a) 1000 (b) 900 (c) 1100 (d) 1200
  36. 36.Which is closest to 304 × 91? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700
  37. 37.Round 41847 to the nearest thousand.
  38. 38.Round 49997 to the nearest hundred.
  39. 39.Round 82.19 to one decimal place. =
  40. 40.Round 59840 to the nearest thousand.

Answer key

  1. 1500
  2. 90700
  3. 90
  4. 12000
  5. 60
  6. 1100
  7. 60
  8. 16.6
  9. 14000
  10. 25000
  11. 49000
  12. 70
  13. 4000
  14. 74.1
  15. 71000
  16. 89900
  17. 48000
  18. 81000
  19. 48000
  20. 10000
  21. 1100
  22. 40
  23. 1400
  24. 40
  25. 52.2
  26. 15.3
  27. 28000
  28. 96.3
  29. 57100
  30. 40
  31. 16.7
  32. 25000
  33. 30
  34. 42000
  35. 1000
  36. 27000
  37. 42000
  38. 50000
  39. 82.2
  40. 60000

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