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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 664 · 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 596 × 28? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  2. 2.Round 41112 to the nearest ten.
  3. 3.Which is closest to 1204 ÷ 41? (a) 300 (b) 60 (c) 30 (d) 15
  4. 4.Round 44.52 to one decimal place. =
  5. 5.Round 65.24 to one decimal place. =
  6. 6.Which is closest to 202 × 21? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  7. 7.Which is closest to 795 ÷ 39? (a) 200 (b) 20 (c) 10 (d) 40
  8. 8.Which is closest to 399 × 32? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  9. 9.Which is closest to 303 × 78? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  10. 10.Which is closest to 898 × 22? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  11. 11.Which is closest to 504 × 49? (Round each number first.) (a) 50000 (b) 250000 (c) 25000 (d) 2500
  12. 12.Which is closest to 798 × 40? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  13. 13.Round 97362 to the nearest ten.
  14. 14.Which is closest to 1192 ÷ 21? (a) 120 (b) 600 (c) 30 (d) 60
  15. 15.Which is closest to 296 × 52? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  16. 16.Which is closest to 204 × 48? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
  17. 17.Round 24.72 to one decimal place. =
  18. 18.Round 23.77 to one decimal place. =
  19. 19.Which is closest to 699 + 695 + 104? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  20. 20.Which is closest to 2394 ÷ 39? (a) 600 (b) 120 (c) 30 (d) 60
  21. 21.Which is closest to 704 + 104 + 799? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  22. 22.Which is closest to 198 × 79? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  23. 23.Which is closest to 1500 ÷ 29? (a) 50 (b) 100 (c) 500 (d) 25
  24. 24.Round 30.29 to one decimal place. =
  25. 25.Which is closest to 899 × 62? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
  26. 26.Which is closest to 401 × 90? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  27. 27.Which is closest to 792 ÷ 39? (a) 10 (b) 40 (c) 20 (d) 200
  28. 28.Round 4578 to the nearest ten.
  29. 29.Round 16954 to the nearest thousand.
  30. 30.Which is closest to 1206 ÷ 31? (a) 40 (b) 400 (c) 80 (d) 20
  31. 31.Which is closest to 897 + 500 + 200? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  32. 32.Round 77028 to the nearest hundred.
  33. 33.Which is closest to 899 + 102 + 795? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  34. 34.Which is closest to 1501 ÷ 29? (a) 500 (b) 50 (c) 100 (d) 25
  35. 35.Which is closest to 295 + 905 + 495? (a) 1600 (b) 1700 (c) 1900 (d) 1800
  36. 36.Which is closest to 801 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  37. 37.Which is closest to 596 + 796 + 198? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  38. 38.Round 10782 to the nearest ten.
  39. 39.Round 44976 to the nearest thousand.
  40. 40.Round 66.11 to one decimal place. =

Answer key

  1. 18000
  2. 41110
  3. 30
  4. 44.5
  5. 65.2
  6. 4000
  7. 20
  8. 12000
  9. 24000
  10. 18000
  11. 25000
  12. 32000
  13. 97360
  14. 60
  15. 15000
  16. 10000
  17. 24.7
  18. 23.8
  19. 1500
  20. 60
  21. 1600
  22. 16000
  23. 50
  24. 30.3
  25. 54000
  26. 36000
  27. 20
  28. 4580
  29. 17000
  30. 40
  31. 1600
  32. 77000
  33. 1800
  34. 50
  35. 1700
  36. 24000
  37. 1600
  38. 10780
  39. 45000
  40. 66.1

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