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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 439 · 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.Round 28.61 to one decimal place. =
  2. 2.Which is closest to 701 × 72? (Round each number first.) (a) 490000 (b) 98000 (c) 49000 (d) 4900
  3. 3.Round 82.88 to one decimal place. =
  4. 4.Round 64.52 to one decimal place. =
  5. 5.Which is closest to 797 + 196 + 301? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  6. 6.Which is closest to 2692 ÷ 31? (a) 180 (b) 900 (c) 90 (d) 45
  7. 7.Round 12551 to the nearest thousand.
  8. 8.Which is closest to 599 + 497 + 697? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  9. 9.Which is closest to 502 × 38? (Round each number first.) (a) 20000 (b) 200000 (c) 2000 (d) 40000
  10. 10.Which is closest to 202 + 902 + 898? (a) 1900 (b) 2200 (c) 2100 (d) 2000
  11. 11.Which is closest to 796 × 30? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  12. 12.Which is closest to 600 × 39? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  13. 13.Which is closest to 304 × 60? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  14. 14.Which is closest to 3208 ÷ 41? (a) 40 (b) 80 (c) 800 (d) 160
  15. 15.Which is closest to 605 ÷ 29? (a) 20 (b) 10 (c) 200 (d) 40
  16. 16.Round 11361 to the nearest thousand.
  17. 17.Round 3797 to the nearest ten.
  18. 18.Which is closest to 601 × 89? (Round each number first.) (a) 5400 (b) 108000 (c) 540000 (d) 54000
  19. 19.Round 38533 to the nearest thousand.
  20. 20.Which is closest to 997 ÷ 49? (a) 10 (b) 40 (c) 20 (d) 200
  21. 21.Which is closest to 296 × 48? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  22. 22.Round 49893 to the nearest ten.
  23. 23.Which is closest to 799 × 41? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  24. 24.Round 13.48 to one decimal place. =
  25. 25.Round 43.67 to one decimal place. =
  26. 26.Which is closest to 698 + 803 + 802? (a) 2500 (b) 2300 (c) 2200 (d) 2400
  27. 27.Round 87199 to the nearest hundred.
  28. 28.Round 63146 to the nearest ten.
  29. 29.Which is closest to 403 × 49? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  30. 30.Which is closest to 1995 ÷ 41? (a) 25 (b) 100 (c) 50 (d) 500
  31. 31.Round 95632 to the nearest ten.
  32. 32.Which is closest to 1597 ÷ 41? (a) 80 (b) 40 (c) 20 (d) 400
  33. 33.Which is closest to 1501 ÷ 49? (a) 60 (b) 30 (c) 300 (d) 15
  34. 34.Which is closest to 2702 ÷ 29? (a) 900 (b) 180 (c) 45 (d) 90
  35. 35.Which is closest to 1605 ÷ 19? (a) 160 (b) 40 (c) 800 (d) 80
  36. 36.Which is closest to 1592 ÷ 19? (a) 160 (b) 800 (c) 80 (d) 40
  37. 37.Which is closest to 798 + 396 + 399? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  38. 38.Which is closest to 504 × 59? (Round each number first.) (a) 3000 (b) 30000 (c) 60000 (d) 300000
  39. 39.Which is closest to 303 × 60? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  40. 40.Which is closest to 598 × 69? (Round each number first.) (a) 420000 (b) 42000 (c) 84000 (d) 4200

Answer key

  1. 28.6
  2. 49000
  3. 82.9
  4. 64.5
  5. 1300
  6. 90
  7. 13000
  8. 1800
  9. 20000
  10. 2000
  11. 24000
  12. 24000
  13. 18000
  14. 80
  15. 20
  16. 11000
  17. 3800
  18. 54000
  19. 39000
  20. 20
  21. 15000
  22. 49890
  23. 32000
  24. 13.5
  25. 43.7
  26. 2300
  27. 87200
  28. 63150
  29. 20000
  30. 50
  31. 95630
  32. 40
  33. 30
  34. 90
  35. 80
  36. 80
  37. 1600
  38. 30000
  39. 18000
  40. 42000

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