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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 817 · 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 792 ÷ 41? (a) 200 (b) 10 (c) 20 (d) 40
  2. 2.Round 45693 to the nearest hundred.
  3. 3.Round 25.21 to one decimal place. =
  4. 4.Which is closest to 302 + 795 + 404? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  5. 5.Round 83781 to the nearest hundred.
  6. 6.Which is closest to 105 + 796 + 105? (a) 1000 (b) 900 (c) 1100 (d) 1200
  7. 7.Which is closest to 803 ÷ 41? (a) 200 (b) 10 (c) 40 (d) 20
  8. 8.Round 4503 to the nearest ten.
  9. 9.Which is closest to 1801 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120
  10. 10.Round 54.64 to one decimal place. =
  11. 11.Which is closest to 596 × 19? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  12. 12.Which is closest to 400 × 52? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  13. 13.Which is closest to 1792 ÷ 19? (a) 180 (b) 45 (c) 90 (d) 900
  14. 14.Which is closest to 204 × 90? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  15. 15.Round 20741 to the nearest thousand.
  16. 16.Round 8731 to the nearest thousand.
  17. 17.Which is closest to 2096 ÷ 29? (a) 35 (b) 700 (c) 140 (d) 70
  18. 18.Which is closest to 796 × 88? (Round each number first.) (a) 72000 (b) 144000 (c) 7200 (d) 720000
  19. 19.Round 30.74 to one decimal place. =
  20. 20.Which is closest to 903 × 18? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  21. 21.Which is closest to 3205 ÷ 41? (a) 800 (b) 40 (c) 80 (d) 160
  22. 22.Which is closest to 602 × 40? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  23. 23.Which is closest to 799 × 40? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  24. 24.Which is closest to 505 + 704 + 98? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  25. 25.Which is closest to 599 × 20? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  26. 26.Which is closest to 909 ÷ 29? (a) 300 (b) 15 (c) 60 (d) 30
  27. 27.Which is closest to 497 + 105 + 98? (a) 900 (b) 700 (c) 600 (d) 800
  28. 28.Which is closest to 703 + 303 + 297? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  29. 29.Round 66.56 to one decimal place. =
  30. 30.Round 45.63 to one decimal place. =
  31. 31.Round 81125 to the nearest hundred.
  32. 32.Round 96268 to the nearest hundred.
  33. 33.Round 22562 to the nearest ten.
  34. 34.Which is closest to 796 + 201 + 396? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  35. 35.Which is closest to 305 + 201 + 899? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  36. 36.Which is closest to 204 + 605 + 800? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  37. 37.Which is closest to 302 × 51? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  38. 38.Which is closest to 903 × 89? (Round each number first.) (a) 810000 (b) 8100 (c) 81000 (d) 162000
  39. 39.Round 82.09 to one decimal place. =
  40. 40.Which is closest to 602 × 38? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400

Answer key

  1. 20
  2. 45700
  3. 25.2
  4. 1500
  5. 83800
  6. 1000
  7. 20
  8. 4500
  9. 60
  10. 54.6
  11. 12000
  12. 20000
  13. 90
  14. 18000
  15. 21000
  16. 9000
  17. 70
  18. 72000
  19. 30.7
  20. 18000
  21. 80
  22. 24000
  23. 32000
  24. 1300
  25. 12000
  26. 30
  27. 700
  28. 1300
  29. 66.6
  30. 45.6
  31. 81100
  32. 96300
  33. 22560
  34. 1400
  35. 1400
  36. 1600
  37. 15000
  38. 81000
  39. 82.1
  40. 24000

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