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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 533 · 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 198 × 20? (Round each number first.) (a) 40000 (b) 400 (c) 4000 (d) 8000
  2. 2.Which is closest to 699 × 20? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  3. 3.Which is closest to 408 ÷ 19? (a) 200 (b) 40 (c) 10 (d) 20
  4. 4.Round 19823 to the nearest ten.
  5. 5.Which is closest to 196 + 201 + 300? (a) 900 (b) 800 (c) 600 (d) 700
  6. 6.Which is closest to 298 × 22? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  7. 7.Which is closest to 203 + 695 + 101? (a) 1200 (b) 1000 (c) 900 (d) 1100
  8. 8.Round 52053 to the nearest ten.
  9. 9.Which is closest to 2496 ÷ 49? (a) 500 (b) 50 (c) 25 (d) 100
  10. 10.Round 73088 to the nearest ten.
  11. 11.Which is closest to 195 + 796 + 198? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  12. 12.Which is closest to 2696 ÷ 31? (a) 180 (b) 45 (c) 900 (d) 90
  13. 13.Round 26064 to the nearest hundred.
  14. 14.Round 68497 to the nearest hundred.
  15. 15.Round 54762 to the nearest hundred.
  16. 16.Which is closest to 600 + 105 + 197? (a) 1000 (b) 1100 (c) 900 (d) 800
  17. 17.Which is closest to 499 × 28? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  18. 18.Round 19.94 to one decimal place. =
  19. 19.Which is closest to 2494 ÷ 49? (a) 50 (b) 500 (c) 100 (d) 25
  20. 20.Which is closest to 295 + 905 + 499? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  21. 21.Which is closest to 402 × 89? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  22. 22.Which is closest to 596 × 41? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  23. 23.Which is closest to 1993 ÷ 41? (a) 500 (b) 100 (c) 50 (d) 25
  24. 24.Which is closest to 304 + 195 + 304? (a) 800 (b) 1000 (c) 700 (d) 900
  25. 25.Round 71.47 to one decimal place. =
  26. 26.Which is closest to 500 × 58? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
  27. 27.Round 32.17 to one decimal place. =
  28. 28.Which is closest to 1605 ÷ 19? (a) 800 (b) 40 (c) 160 (d) 80
  29. 29.Round 60.19 to one decimal place. =
  30. 30.Which is closest to 2703 ÷ 31? (a) 90 (b) 900 (c) 180 (d) 45
  31. 31.Round 84.56 to one decimal place. =
  32. 32.Round 63.32 to one decimal place. =
  33. 33.Which is closest to 2409 ÷ 29? (a) 40 (b) 80 (c) 160 (d) 800
  34. 34.Round 88.37 to one decimal place. =
  35. 35.Which is closest to 2791 ÷ 41? (a) 35 (b) 70 (c) 140 (d) 700
  36. 36.Round 29855 to the nearest hundred.
  37. 37.Which is closest to 798 ÷ 19? (a) 400 (b) 20 (c) 40 (d) 80
  38. 38.Round 71.86 to one decimal place. =
  39. 39.Round 66584 to the nearest thousand.
  40. 40.Round 32680 to the nearest thousand.

Answer key

  1. 4000
  2. 14000
  3. 20
  4. 19820
  5. 700
  6. 6000
  7. 1000
  8. 52050
  9. 50
  10. 73090
  11. 1200
  12. 90
  13. 26100
  14. 68500
  15. 54800
  16. 900
  17. 15000
  18. 19.9
  19. 50
  20. 1700
  21. 36000
  22. 24000
  23. 50
  24. 800
  25. 71.5
  26. 30000
  27. 32.2
  28. 80
  29. 60.2
  30. 90
  31. 84.6
  32. 63.3
  33. 80
  34. 88.4
  35. 70
  36. 29900
  37. 40
  38. 71.9
  39. 67000
  40. 33000

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