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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 591 · 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 598 × 28? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  2. 2.Round 94.64 to one decimal place. =
  3. 3.Which is closest to 2109 ÷ 29? (a) 35 (b) 140 (c) 70 (d) 700
  4. 4.Round 26909 to the nearest ten.
  5. 5.Which is closest to 502 × 19? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
  6. 6.Round 10.89 to one decimal place. =
  7. 7.Which is closest to 700 × 59? (Round each number first.) (a) 420000 (b) 84000 (c) 42000 (d) 4200
  8. 8.Which is closest to 897 × 22? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  9. 9.Round 95098 to the nearest hundred.
  10. 10.Which is closest to 697 × 22? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  11. 11.Which is closest to 598 × 30? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  12. 12.Which is closest to 503 + 696 + 195? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  13. 13.Which is closest to 596 × 38? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  14. 14.Round 12.52 to one decimal place. =
  15. 15.Which is closest to 598 × 41? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  16. 16.Which is closest to 598 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  17. 17.Which is closest to 897 × 89? (Round each number first.) (a) 81000 (b) 810000 (c) 162000 (d) 8100
  18. 18.Which is closest to 100 + 298 + 300? (a) 800 (b) 600 (c) 900 (d) 700
  19. 19.Round 51.08 to one decimal place. =
  20. 20.Round 99521 to the nearest hundred.
  21. 21.Round 64.16 to one decimal place. =
  22. 22.Which is closest to 904 × 50? (Round each number first.) (a) 45000 (b) 4500 (c) 450000 (d) 90000
  23. 23.Round 88014 to the nearest thousand.
  24. 24.Which is closest to 1793 ÷ 19? (a) 90 (b) 900 (c) 45 (d) 180
  25. 25.Which is closest to 895 + 696 + 499? (a) 2200 (b) 2300 (c) 2100 (d) 2000
  26. 26.Which is closest to 899 × 58? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  27. 27.Which is closest to 1594 ÷ 41? (a) 80 (b) 400 (c) 40 (d) 20
  28. 28.Round 34.31 to one decimal place. =
  29. 29.Round 32024 to the nearest hundred.
  30. 30.Round 28.47 to one decimal place. =
  31. 31.Which is closest to 697 + 805 + 201? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  32. 32.Which is closest to 596 + 495 + 695? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  33. 33.Round 7549 to the nearest thousand.
  34. 34.Round 65383 to the nearest ten.
  35. 35.Which is closest to 608 ÷ 31? (a) 40 (b) 200 (c) 10 (d) 20
  36. 36.Round 32.57 to one decimal place. =
  37. 37.Round 49.86 to one decimal place. =
  38. 38.Which is closest to 2003 ÷ 39? (a) 50 (b) 25 (c) 500 (d) 100
  39. 39.Which is closest to 501 + 398 + 700? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  40. 40.Round 34583 to the nearest ten.

Answer key

  1. 18000
  2. 94.6
  3. 70
  4. 26910
  5. 10000
  6. 10.9
  7. 42000
  8. 18000
  9. 95100
  10. 14000
  11. 18000
  12. 1400
  13. 24000
  14. 12.5
  15. 24000
  16. 20
  17. 81000
  18. 700
  19. 51.1
  20. 99500
  21. 64.2
  22. 45000
  23. 88000
  24. 90
  25. 2100
  26. 54000
  27. 40
  28. 34.3
  29. 32000
  30. 28.5
  31. 1700
  32. 1800
  33. 8000
  34. 65380
  35. 20
  36. 32.6
  37. 49.9
  38. 50
  39. 1600
  40. 34580

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