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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 504 · 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 899 × 51? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  2. 2.Which is closest to 1808 ÷ 29? (a) 60 (b) 600 (c) 30 (d) 120
  3. 3.Which is closest to 2998 ÷ 49? (a) 600 (b) 30 (c) 60 (d) 120
  4. 4.Which is closest to 2998 ÷ 51? (a) 30 (b) 600 (c) 120 (d) 60
  5. 5.Which is closest to 701 × 40? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  6. 6.Which is closest to 2800 ÷ 41? (a) 70 (b) 700 (c) 35 (d) 140
  7. 7.Which is closest to 697 × 92? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  8. 8.Round 97904 to the nearest ten.
  9. 9.Which is closest to 703 + 202 + 98? (a) 1000 (b) 1100 (c) 900 (d) 1200
  10. 10.Which is closest to 403 + 104 + 505? (a) 1200 (b) 900 (c) 1000 (d) 1100
  11. 11.Round 69832 to the nearest ten.
  12. 12.Which is closest to 197 × 72? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  13. 13.Which is closest to 197 × 18? (Round each number first.) (a) 8000 (b) 40000 (c) 4000 (d) 400
  14. 14.Round 79082 to the nearest thousand.
  15. 15.Which is closest to 503 + 797 + 504? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  16. 16.Round 83.76 to one decimal place. =
  17. 17.Which is closest to 608 ÷ 31? (a) 20 (b) 40 (c) 10 (d) 200
  18. 18.Which is closest to 104 + 101 + 700? (a) 1000 (b) 1100 (c) 900 (d) 800
  19. 19.Which is closest to 203 × 88? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  20. 20.Which is closest to 995 ÷ 21? (a) 100 (b) 50 (c) 25 (d) 500
  21. 21.Which is closest to 407 ÷ 19? (a) 10 (b) 20 (c) 200 (d) 40
  22. 22.Which is closest to 902 × 31? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  23. 23.Round 22.19 to one decimal place. =
  24. 24.Which is closest to 603 + 95 + 701? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  25. 25.Which is closest to 302 + 501 + 201? (a) 1200 (b) 1100 (c) 900 (d) 1000
  26. 26.Which is closest to 1200 ÷ 21? (a) 120 (b) 30 (c) 60 (d) 600
  27. 27.Round 20.32 to one decimal place. =
  28. 28.Round 27967 to the nearest thousand.
  29. 29.Which is closest to 798 + 196 + 302? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  30. 30.Which is closest to 1202 ÷ 21? (a) 120 (b) 600 (c) 30 (d) 60
  31. 31.Which is closest to 399 × 58? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  32. 32.Which is closest to 505 + 702 + 500? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  33. 33.Which is closest to 901 + 702 + 599? (a) 2400 (b) 2300 (c) 2100 (d) 2200
  34. 34.Round 85588 to the nearest ten.
  35. 35.Which is closest to 2405 ÷ 39? (a) 600 (b) 120 (c) 60 (d) 30
  36. 36.Which is closest to 599 ÷ 21? (a) 60 (b) 300 (c) 30 (d) 15
  37. 37.Which is closest to 597 × 81? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  38. 38.Which is closest to 695 + 297 + 803? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  39. 39.Round 76.22 to one decimal place. =
  40. 40.Which is closest to 504 × 62? (Round each number first.) (a) 60000 (b) 300000 (c) 30000 (d) 3000

Answer key

  1. 45000
  2. 60
  3. 60
  4. 60
  5. 28000
  6. 70
  7. 63000
  8. 97900
  9. 1000
  10. 1000
  11. 69830
  12. 14000
  13. 4000
  14. 79000
  15. 1800
  16. 83.8
  17. 20
  18. 900
  19. 18000
  20. 50
  21. 20
  22. 27000
  23. 22.2
  24. 1400
  25. 1000
  26. 60
  27. 20.3
  28. 28000
  29. 1300
  30. 60
  31. 24000
  32. 1700
  33. 2200
  34. 85590
  35. 60
  36. 30
  37. 48000
  38. 1800
  39. 76.2
  40. 30000

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