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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 722 · 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 44.56 to one decimal place. =
  2. 2.Which is closest to 804 × 71? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  3. 3.Which is closest to 800 + 703 + 201? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  4. 4.Which is closest to 403 × 79? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
  5. 5.Which is closest to 1791 ÷ 19? (a) 900 (b) 90 (c) 180 (d) 45
  6. 6.Which is closest to 695 + 402 + 101? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  7. 7.Round 90342 to the nearest hundred.
  8. 8.Round 54827 to the nearest hundred.
  9. 9.Which is closest to 804 + 696 + 397? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  10. 10.Which is closest to 798 × 88? (Round each number first.) (a) 144000 (b) 72000 (c) 7200 (d) 720000
  11. 11.Which is closest to 2497 ÷ 49? (a) 50 (b) 25 (c) 100 (d) 500
  12. 12.Which is closest to 1603 ÷ 41? (a) 40 (b) 80 (c) 400 (d) 20
  13. 13.Round 83.34 to one decimal place. =
  14. 14.Which is closest to 196 + 598 + 696? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  15. 15.Which is closest to 503 × 28? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  16. 16.Which is closest to 797 × 19? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  17. 17.Round 22941 to the nearest hundred.
  18. 18.Which is closest to 4503 ÷ 49? (a) 180 (b) 900 (c) 90 (d) 45
  19. 19.Which is closest to 496 × 59? (Round each number first.) (a) 3000 (b) 300000 (c) 30000 (d) 60000
  20. 20.Which is closest to 96 + 302 + 296? (a) 600 (b) 900 (c) 800 (d) 700
  21. 21.Which is closest to 595 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  22. 22.Round 51009 to the nearest hundred.
  23. 23.Which is closest to 896 × 42? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
  24. 24.Which is closest to 904 × 22? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  25. 25.Which is closest to 296 + 295 + 498? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  26. 26.Round 99247 to the nearest hundred.
  27. 27.Which is closest to 2999 ÷ 49? (a) 30 (b) 600 (c) 60 (d) 120
  28. 28.Round 75.42 to one decimal place. =
  29. 29.Round 35622 to the nearest thousand.
  30. 30.Which is closest to 98 + 895 + 599? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  31. 31.Which is closest to 1203 ÷ 29? (a) 20 (b) 80 (c) 400 (d) 40
  32. 32.Which is closest to 2501 ÷ 49? (a) 100 (b) 25 (c) 500 (d) 50
  33. 33.Which is closest to 499 + 302 + 799? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  34. 34.Which is closest to 1494 ÷ 31? (a) 25 (b) 100 (c) 50 (d) 500
  35. 35.Round 7842 to the nearest hundred.
  36. 36.Round 70602 to the nearest thousand.
  37. 37.Which is closest to 803 + 395 + 303? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  38. 38.Which is closest to 799 × 28? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  39. 39.Which is closest to 298 × 68? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  40. 40.Round 27.79 to one decimal place. =

Answer key

  1. 44.6
  2. 56000
  3. 1700
  4. 32000
  5. 90
  6. 1200
  7. 90300
  8. 54800
  9. 1900
  10. 72000
  11. 50
  12. 40
  13. 83.3
  14. 1500
  15. 15000
  16. 16000
  17. 22900
  18. 90
  19. 30000
  20. 700
  21. 20
  22. 51000
  23. 36000
  24. 18000
  25. 1100
  26. 99200
  27. 60
  28. 75.4
  29. 36000
  30. 1600
  31. 40
  32. 50
  33. 1600
  34. 50
  35. 7800
  36. 71000
  37. 1500
  38. 24000
  39. 21000
  40. 27.8

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