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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 680 · 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 302 × 30? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000
  2. 2.Which is closest to 903 ÷ 31? (a) 60 (b) 30 (c) 300 (d) 15
  3. 3.Which is closest to 1607 ÷ 21? (a) 800 (b) 160 (c) 40 (d) 80
  4. 4.Which is closest to 604 × 18? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  5. 5.Which is closest to 196 + 498 + 97? (a) 1000 (b) 800 (c) 900 (d) 700
  6. 6.Which is closest to 1608 ÷ 41? (a) 80 (b) 40 (c) 400 (d) 20
  7. 7.Which is closest to 705 + 495 + 605? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  8. 8.Round 42320 to the nearest hundred.
  9. 9.Round 17.92 to one decimal place. =
  10. 10.Which is closest to 504 + 498 + 902? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  11. 11.Which is closest to 2804 ÷ 39? (a) 70 (b) 140 (c) 700 (d) 35
  12. 12.Round 54.83 to one decimal place. =
  13. 13.Round 67842 to the nearest thousand.
  14. 14.Which is closest to 404 × 60? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  15. 15.Round 7187 to the nearest ten.
  16. 16.Round 5592 to the nearest ten.
  17. 17.Which is closest to 902 ÷ 29? (a) 300 (b) 30 (c) 15 (d) 60
  18. 18.Round 72036 to the nearest ten.
  19. 19.Round 92.64 to one decimal place. =
  20. 20.Which is closest to 3993 ÷ 51? (a) 800 (b) 40 (c) 80 (d) 160
  21. 21.Which is closest to 402 + 704 + 897? (a) 1900 (b) 2000 (c) 2100 (d) 2200
  22. 22.Which is closest to 698 × 31? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
  23. 23.Which is closest to 199 × 18? (Round each number first.) (a) 4000 (b) 400 (c) 8000 (d) 40000
  24. 24.Which is closest to 2707 ÷ 31? (a) 900 (b) 180 (c) 90 (d) 45
  25. 25.Which is closest to 597 × 22? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  26. 26.Round 28126 to the nearest hundred.
  27. 27.Which is closest to 1501 ÷ 31? (a) 50 (b) 100 (c) 500 (d) 25
  28. 28.Which is closest to 899 × 89? (Round each number first.) (a) 810000 (b) 162000 (c) 81000 (d) 8100
  29. 29.Which is closest to 600 + 204 + 299? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  30. 30.Round 48.24 to one decimal place. =
  31. 31.Round 71.08 to one decimal place. =
  32. 32.Round 69.38 to one decimal place. =
  33. 33.Which is closest to 905 + 301 + 200? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  34. 34.Round 21.41 to one decimal place. =
  35. 35.Which is closest to 402 + 95 + 604? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  36. 36.Which is closest to 2704 ÷ 29? (a) 90 (b) 900 (c) 180 (d) 45
  37. 37.Which is closest to 600 × 79? (Round each number first.) (a) 4800 (b) 48000 (c) 480000 (d) 96000
  38. 38.Which is closest to 699 × 28? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  39. 39.Which is closest to 902 + 101 + 704? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  40. 40.Which is closest to 1505 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500

Answer key

  1. 9000
  2. 30
  3. 80
  4. 12000
  5. 800
  6. 40
  7. 1800
  8. 42300
  9. 17.9
  10. 1900
  11. 70
  12. 54.8
  13. 68000
  14. 24000
  15. 7190
  16. 5590
  17. 30
  18. 72040
  19. 92.6
  20. 80
  21. 2000
  22. 21000
  23. 4000
  24. 90
  25. 12000
  26. 28100
  27. 50
  28. 81000
  29. 1100
  30. 48.2
  31. 71.1
  32. 69.4
  33. 1400
  34. 21.4
  35. 1100
  36. 90
  37. 48000
  38. 21000
  39. 1700
  40. 50

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