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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 798 · 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 3196 ÷ 41? (a) 40 (b) 80 (c) 160 (d) 800
  2. 2.Which is closest to 903 × 61? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
  3. 3.Round 55.68 to one decimal place. =
  4. 4.Which is closest to 1595 ÷ 21? (a) 800 (b) 160 (c) 40 (d) 80
  5. 5.Which is closest to 704 × 32? (Round each number first.) (a) 210000 (b) 21000 (c) 42000 (d) 2100
  6. 6.Round 79394 to the nearest ten.
  7. 7.Round 88.28 to one decimal place. =
  8. 8.Round 66.84 to one decimal place. =
  9. 9.Which is closest to 1201 ÷ 31? (a) 40 (b) 80 (c) 20 (d) 400
  10. 10.Round 34.88 to one decimal place. =
  11. 11.Which is closest to 302 × 20? (Round each number first.) (a) 6000 (b) 12000 (c) 60000 (d) 600
  12. 12.Which is closest to 404 × 22? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  13. 13.Round 38.72 to one decimal place. =
  14. 14.Which is closest to 703 × 60? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
  15. 15.Which is closest to 695 + 500 + 195? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  16. 16.Which is closest to 398 × 58? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  17. 17.Round 33403 to the nearest ten.
  18. 18.Round 80589 to the nearest hundred.
  19. 19.Which is closest to 1209 ÷ 39? (a) 30 (b) 300 (c) 15 (d) 60
  20. 20.Which is closest to 697 × 90? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
  21. 21.Which is closest to 901 × 82? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  22. 22.Which is closest to 297 × 49? (Round each number first.) (a) 15000 (b) 150000 (c) 1500 (d) 30000
  23. 23.Round 99.74 to one decimal place. =
  24. 24.Which is closest to 500 + 98 + 697? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  25. 25.Which is closest to 604 × 48? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  26. 26.Which is closest to 98 + 195 + 196? (a) 600 (b) 400 (c) 700 (d) 500
  27. 27.Which is closest to 1501 ÷ 51? (a) 300 (b) 60 (c) 30 (d) 15
  28. 28.Round 53.91 to one decimal place. =
  29. 29.Round 60329 to the nearest hundred.
  30. 30.Which is closest to 602 + 103 + 695? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  31. 31.Round 91135 to the nearest hundred.
  32. 32.Which is closest to 801 × 38? (Round each number first.) (a) 64000 (b) 320000 (c) 32000 (d) 3200
  33. 33.Which is closest to 599 × 31? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  34. 34.Which is closest to 504 × 62? (Round each number first.) (a) 300000 (b) 30000 (c) 3000 (d) 60000
  35. 35.Round 52.07 to one decimal place. =
  36. 36.Which is closest to 496 × 48? (Round each number first.) (a) 2500 (b) 25000 (c) 250000 (d) 50000
  37. 37.Round 30.88 to one decimal place. =
  38. 38.Which is closest to 3504 ÷ 49? (a) 140 (b) 70 (c) 35 (d) 700
  39. 39.Round 60.62 to one decimal place. =
  40. 40.Which is closest to 499 × 18? (Round each number first.) (a) 1000 (b) 10000 (c) 20000 (d) 100000

Answer key

  1. 80
  2. 54000
  3. 55.7
  4. 80
  5. 21000
  6. 79390
  7. 88.3
  8. 66.8
  9. 40
  10. 34.9
  11. 6000
  12. 8000
  13. 38.7
  14. 42000
  15. 1400
  16. 24000
  17. 33400
  18. 80600
  19. 30
  20. 63000
  21. 72000
  22. 15000
  23. 99.7
  24. 1300
  25. 30000
  26. 500
  27. 30
  28. 53.9
  29. 60300
  30. 1400
  31. 91100
  32. 32000
  33. 18000
  34. 30000
  35. 52.1
  36. 25000
  37. 30.9
  38. 70
  39. 60.6
  40. 10000

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