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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 234 · 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 799 × 39? (Round each number first.) (a) 32000 (b) 320000 (c) 64000 (d) 3200
  2. 2.Which is closest to 602 × 52? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
  3. 3.Which is closest to 698 + 101 + 196? (a) 900 (b) 1000 (c) 1200 (d) 1100
  4. 4.Which is closest to 2399 ÷ 39? (a) 30 (b) 120 (c) 60 (d) 600
  5. 5.Which is closest to 802 × 60? (Round each number first.) (a) 96000 (b) 480000 (c) 48000 (d) 4800
  6. 6.Which is closest to 800 + 402 + 404? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  7. 7.Which is closest to 596 + 98 + 95? (a) 900 (b) 1000 (c) 700 (d) 800
  8. 8.Which is closest to 1396 ÷ 19? (a) 70 (b) 700 (c) 140 (d) 35
  9. 9.Round 61833 to the nearest ten.
  10. 10.Which is closest to 602 ÷ 21? (a) 30 (b) 60 (c) 300 (d) 15
  11. 11.Which is closest to 3998 ÷ 49? (a) 800 (b) 40 (c) 80 (d) 160
  12. 12.Which is closest to 403 × 72? (Round each number first.) (a) 28000 (b) 280000 (c) 56000 (d) 2800
  13. 13.Which is closest to 701 + 597 + 795? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  14. 14.Which is closest to 1607 ÷ 19? (a) 80 (b) 800 (c) 40 (d) 160
  15. 15.Which is closest to 500 × 58? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  16. 16.Which is closest to 604 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  17. 17.Which is closest to 204 × 58? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  18. 18.Which is closest to 697 + 595 + 805? (a) 2300 (b) 2100 (c) 2200 (d) 2000
  19. 19.Which is closest to 899 × 82? (Round each number first.) (a) 144000 (b) 720000 (c) 7200 (d) 72000
  20. 20.Round 18528 to the nearest hundred.
  21. 21.Round 44.86 to one decimal place. =
  22. 22.Which is closest to 298 × 40? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  23. 23.Round 88.61 to one decimal place. =
  24. 24.Which is closest to 201 × 32? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  25. 25.Round 52.24 to one decimal place. =
  26. 26.Which is closest to 203 + 796 + 900? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  27. 27.Which is closest to 403 + 905 + 200? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  28. 28.Round 20.38 to one decimal place. =
  29. 29.Round 44960 to the nearest hundred.
  30. 30.Which is closest to 405 + 496 + 596? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  31. 31.Which is closest to 3194 ÷ 39? (a) 80 (b) 40 (c) 160 (d) 800
  32. 32.Round 42744 to the nearest ten.
  33. 33.Which is closest to 796 × 19? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  34. 34.Which is closest to 502 × 30? (Round each number first.) (a) 1500 (b) 15000 (c) 150000 (d) 30000
  35. 35.Which is closest to 2091 ÷ 29? (a) 70 (b) 140 (c) 35 (d) 700
  36. 36.Round 54611 to the nearest ten.
  37. 37.Round 67.42 to one decimal place. =
  38. 38.Round 39.16 to one decimal place. =
  39. 39.Round 35.94 to one decimal place. =
  40. 40.Which is closest to 1807 ÷ 31? (a) 600 (b) 120 (c) 30 (d) 60

Answer key

  1. 32000
  2. 30000
  3. 1000
  4. 60
  5. 48000
  6. 1600
  7. 800
  8. 70
  9. 61830
  10. 30
  11. 80
  12. 28000
  13. 2100
  14. 80
  15. 30000
  16. 20
  17. 12000
  18. 2100
  19. 72000
  20. 18500
  21. 44.9
  22. 12000
  23. 88.6
  24. 6000
  25. 52.2
  26. 1900
  27. 1500
  28. 20.4
  29. 45000
  30. 1500
  31. 80
  32. 42740
  33. 16000
  34. 15000
  35. 70
  36. 54610
  37. 67.4
  38. 39.2
  39. 35.9
  40. 60

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