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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 159 · 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 25179 to the nearest ten.
  2. 2.Which is closest to 499 × 91? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  3. 3.Which is closest to 395 + 397 + 304? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  4. 4.Which is closest to 1805 ÷ 29? (a) 60 (b) 600 (c) 30 (d) 120
  5. 5.Round 25.91 to one decimal place. =
  6. 6.Which is closest to 98 + 97 + 202? (a) 400 (b) 500 (c) 600 (d) 300
  7. 7.Which is closest to 697 + 901 + 795? (a) 2300 (b) 2600 (c) 2400 (d) 2500
  8. 8.Which is closest to 196 + 202 + 800? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  9. 9.Which is closest to 701 × 60? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  10. 10.Which is closest to 104 + 700 + 796? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  11. 11.Which is closest to 595 ÷ 31? (a) 200 (b) 40 (c) 20 (d) 10
  12. 12.Which is closest to 298 + 204 + 502? (a) 1200 (b) 1000 (c) 1100 (d) 900
  13. 13.Which is closest to 900 × 88? (Round each number first.) (a) 810000 (b) 8100 (c) 81000 (d) 162000
  14. 14.Which is closest to 101 + 502 + 201? (a) 700 (b) 1000 (c) 900 (d) 800
  15. 15.Round 73.92 to one decimal place. =
  16. 16.Which is closest to 203 × 42? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  17. 17.Which is closest to 598 + 104 + 597? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  18. 18.Which is closest to 1996 ÷ 41? (a) 25 (b) 100 (c) 50 (d) 500
  19. 19.Round 86940 to the nearest hundred.
  20. 20.Round 77.32 to one decimal place. =
  21. 21.Round 20.56 to one decimal place. =
  22. 22.Round 73304 to the nearest thousand.
  23. 23.Which is closest to 500 × 51? (Round each number first.) (a) 50000 (b) 25000 (c) 250000 (d) 2500
  24. 24.Round 13447 to the nearest ten.
  25. 25.Which is closest to 603 + 898 + 200? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  26. 26.Which is closest to 792 ÷ 19? (a) 80 (b) 40 (c) 400 (d) 20
  27. 27.Which is closest to 797 + 900 + 901? (a) 2500 (b) 2800 (c) 2700 (d) 2600
  28. 28.Which is closest to 1500 ÷ 29? (a) 100 (b) 25 (c) 500 (d) 50
  29. 29.Which is closest to 699 × 71? (Round each number first.) (a) 98000 (b) 4900 (c) 490000 (d) 49000
  30. 30.Which is closest to 597 + 597 + 904? (a) 2300 (b) 2200 (c) 2000 (d) 2100
  31. 31.Round 98.36 to one decimal place. =
  32. 32.Which is closest to 403 × 78? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  33. 33.Round 41544 to the nearest ten.
  34. 34.Round 23869 to the nearest thousand.
  35. 35.Which is closest to 2095 ÷ 31? (a) 35 (b) 700 (c) 70 (d) 140
  36. 36.Round 1174 to the nearest hundred.
  37. 37.Which is closest to 396 × 69? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  38. 38.Which is closest to 4494 ÷ 51? (a) 900 (b) 90 (c) 180 (d) 45
  39. 39.Which is closest to 991 ÷ 19? (a) 25 (b) 100 (c) 500 (d) 50
  40. 40.Round 29352 to the nearest thousand.

Answer key

  1. 25180
  2. 45000
  3. 1100
  4. 60
  5. 25.9
  6. 400
  7. 2400
  8. 1200
  9. 42000
  10. 1600
  11. 20
  12. 1000
  13. 81000
  14. 800
  15. 73.9
  16. 8000
  17. 1300
  18. 50
  19. 86900
  20. 77.3
  21. 20.6
  22. 73000
  23. 25000
  24. 13450
  25. 1700
  26. 40
  27. 2600
  28. 50
  29. 49000
  30. 2100
  31. 98.4
  32. 32000
  33. 41540
  34. 24000
  35. 70
  36. 1200
  37. 28000
  38. 90
  39. 50
  40. 29000

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