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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 248 · 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 803 + 605 + 104? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  2. 2.Round 89.63 to one decimal place. =
  3. 3.Which is closest to 596 × 52? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  4. 4.Round 85718 to the nearest thousand.
  5. 5.Which is closest to 195 + 299 + 795? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  6. 6.Round 14.52 to one decimal place. =
  7. 7.Which is closest to 498 × 71? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  8. 8.Which is closest to 301 + 302 + 97? (a) 700 (b) 800 (c) 900 (d) 600
  9. 9.Which is closest to 806 ÷ 41? (a) 20 (b) 40 (c) 10 (d) 200
  10. 10.Which is closest to 904 × 18? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  11. 11.Which is closest to 3603 ÷ 39? (a) 45 (b) 900 (c) 90 (d) 180
  12. 12.Round 44630 to the nearest hundred.
  13. 13.Which is closest to 197 × 90? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  14. 14.Round 48.66 to one decimal place. =
  15. 15.Which is closest to 799 + 398 + 196? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  16. 16.Round 12958 to the nearest ten.
  17. 17.Which is closest to 800 + 295 + 895? (a) 2000 (b) 2200 (c) 2100 (d) 1900
  18. 18.Which is closest to 595 + 801 + 504? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  19. 19.Which is closest to 795 ÷ 41? (a) 40 (b) 200 (c) 10 (d) 20
  20. 20.Which is closest to 303 × 60? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  21. 21.Which is closest to 100 + 397 + 600? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  22. 22.Round 18986 to the nearest thousand.
  23. 23.Which is closest to 202 + 304 + 401? (a) 1000 (b) 800 (c) 900 (d) 1100
  24. 24.Which is closest to 197 + 597 + 795? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  25. 25.Which is closest to 705 + 500 + 302? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  26. 26.Round 63932 to the nearest thousand.
  27. 27.Which is closest to 1395 ÷ 21? (a) 70 (b) 35 (c) 700 (d) 140
  28. 28.Round 23623 to the nearest thousand.
  29. 29.Which is closest to 801 × 30? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  30. 30.Round 71490 to the nearest thousand.
  31. 31.Which is closest to 295 + 98 + 797? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  32. 32.Round 85018 to the nearest hundred.
  33. 33.Which is closest to 701 × 92? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  34. 34.Round 57.53 to one decimal place. =
  35. 35.Which is closest to 391 ÷ 19? (a) 10 (b) 20 (c) 40 (d) 200
  36. 36.Which is closest to 1507 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  37. 37.Which is closest to 201 + 98 + 397? (a) 600 (b) 900 (c) 800 (d) 700
  38. 38.Which is closest to 795 + 795 + 503? (a) 2200 (b) 2100 (c) 2000 (d) 2300
  39. 39.Which is closest to 902 + 796 + 905? (a) 2500 (b) 2700 (c) 2800 (d) 2600
  40. 40.Round 67127 to the nearest ten.

Answer key

  1. 1500
  2. 89.6
  3. 30000
  4. 86000
  5. 1300
  6. 14.5
  7. 35000
  8. 700
  9. 20
  10. 18000
  11. 90
  12. 44600
  13. 18000
  14. 48.7
  15. 1400
  16. 12960
  17. 2000
  18. 1900
  19. 20
  20. 18000
  21. 1100
  22. 19000
  23. 900
  24. 1600
  25. 1500
  26. 64000
  27. 70
  28. 24000
  29. 24000
  30. 71000
  31. 1200
  32. 85000
  33. 63000
  34. 57.5
  35. 20
  36. 30
  37. 700
  38. 2100
  39. 2600
  40. 67130

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