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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 494 · 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 199 × 28? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  2. 2.Which is closest to 798 × 52? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  3. 3.Round 44.64 to one decimal place. =
  4. 4.Which is closest to 302 × 78? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  5. 5.Which is closest to 200 × 92? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  6. 6.Which is closest to 701 + 499 + 604? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  7. 7.Round 27851 to the nearest ten.
  8. 8.Round 71.16 to one decimal place. =
  9. 9.Which is closest to 993 ÷ 21? (a) 500 (b) 50 (c) 100 (d) 25
  10. 10.Which is closest to 699 + 304 + 400? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  11. 11.Which is closest to 402 × 89? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  12. 12.Which is closest to 801 × 38? (Round each number first.) (a) 3200 (b) 64000 (c) 32000 (d) 320000
  13. 13.Round 38.76 to one decimal place. =
  14. 14.Which is closest to 304 + 95 + 604? (a) 1100 (b) 1000 (c) 900 (d) 1200
  15. 15.Which is closest to 405 + 695 + 701? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  16. 16.Which is closest to 798 ÷ 19? (a) 20 (b) 40 (c) 400 (d) 80
  17. 17.Round 33.23 to one decimal place. =
  18. 18.Which is closest to 798 + 497 + 695? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  19. 19.Round 97656 to the nearest ten.
  20. 20.Which is closest to 399 × 32? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  21. 21.Which is closest to 1999 ÷ 41? (a) 500 (b) 100 (c) 25 (d) 50
  22. 22.Round 87016 to the nearest hundred.
  23. 23.Round 48834 to the nearest hundred.
  24. 24.Round 31.49 to one decimal place. =
  25. 25.Round 13.46 to one decimal place. =
  26. 26.Which is closest to 303 + 497 + 696? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  27. 27.Round 65636 to the nearest thousand.
  28. 28.Which is closest to 1992 ÷ 49? (a) 400 (b) 80 (c) 40 (d) 20
  29. 29.Which is closest to 3493 ÷ 51? (a) 140 (b) 700 (c) 70 (d) 35
  30. 30.Which is closest to 404 × 52? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  31. 31.Which is closest to 401 × 38? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  32. 32.Which is closest to 103 + 195 + 501? (a) 800 (b) 1000 (c) 700 (d) 900
  33. 33.Round 80.17 to one decimal place. =
  34. 34.Round 89319 to the nearest ten.
  35. 35.Which is closest to 1004 ÷ 49? (a) 200 (b) 40 (c) 10 (d) 20
  36. 36.Round 62.22 to one decimal place. =
  37. 37.Which is closest to 100 + 595 + 600? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  38. 38.Which is closest to 703 × 69? (Round each number first.) (a) 490000 (b) 4900 (c) 49000 (d) 98000
  39. 39.Which is closest to 599 + 199 + 397? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  40. 40.Round 12.54 to one decimal place. =

Answer key

  1. 6000
  2. 40000
  3. 44.6
  4. 24000
  5. 18000
  6. 1800
  7. 27850
  8. 71.2
  9. 50
  10. 1400
  11. 36000
  12. 32000
  13. 38.8
  14. 1000
  15. 1800
  16. 40
  17. 33.2
  18. 2000
  19. 97660
  20. 12000
  21. 50
  22. 87000
  23. 48800
  24. 31.5
  25. 13.5
  26. 1500
  27. 66000
  28. 40
  29. 70
  30. 20000
  31. 16000
  32. 800
  33. 80.2
  34. 89320
  35. 20
  36. 62.2
  37. 1300
  38. 49000
  39. 1200
  40. 12.5

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