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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 667 · 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 33929 to the nearest ten.
  2. 2.Which is closest to 791 ÷ 19? (a) 80 (b) 40 (c) 400 (d) 20
  3. 3.Which is closest to 1995 ÷ 39? (a) 25 (b) 50 (c) 500 (d) 100
  4. 4.Which is closest to 796 ÷ 39? (a) 10 (b) 200 (c) 40 (d) 20
  5. 5.Round 73659 to the nearest hundred.
  6. 6.Which is closest to 2003 ÷ 51? (a) 80 (b) 20 (c) 400 (d) 40
  7. 7.Round 18030 to the nearest hundred.
  8. 8.Which is closest to 1595 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  9. 9.Round 70.34 to one decimal place. =
  10. 10.Which is closest to 3509 ÷ 49? (a) 700 (b) 35 (c) 140 (d) 70
  11. 11.Round 76.39 to one decimal place. =
  12. 12.Which is closest to 1191 ÷ 41? (a) 30 (b) 300 (c) 60 (d) 15
  13. 13.Round 99559 to the nearest hundred.
  14. 14.Round 37.62 to one decimal place. =
  15. 15.Which is closest to 799 + 801 + 204? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  16. 16.Which is closest to 1201 ÷ 39? (a) 300 (b) 60 (c) 15 (d) 30
  17. 17.Which is closest to 903 × 51? (Round each number first.) (a) 45000 (b) 4500 (c) 450000 (d) 90000
  18. 18.Which is closest to 597 + 896 + 595? (a) 2200 (b) 2100 (c) 2000 (d) 2300
  19. 19.Round 53641 to the nearest ten.
  20. 20.Which is closest to 495 + 700 + 697? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  21. 21.Which is closest to 996 ÷ 51? (a) 10 (b) 20 (c) 40 (d) 200
  22. 22.Which is closest to 1202 ÷ 39? (a) 30 (b) 60 (c) 15 (d) 300
  23. 23.Which is closest to 897 × 21? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  24. 24.Which is closest to 394 ÷ 21? (a) 200 (b) 40 (c) 20 (d) 10
  25. 25.Round 96.71 to one decimal place. =
  26. 26.Which is closest to 205 + 199 + 900? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  27. 27.Which is closest to 300 × 22? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  28. 28.Which is closest to 1806 ÷ 21? (a) 900 (b) 45 (c) 90 (d) 180
  29. 29.Round 81046 to the nearest hundred.
  30. 30.Round 85714 to the nearest ten.
  31. 31.Which is closest to 197 × 30? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  32. 32.Round 93439 to the nearest ten.
  33. 33.Which is closest to 2395 ÷ 31? (a) 800 (b) 40 (c) 160 (d) 80
  34. 34.Round 74.34 to one decimal place. =
  35. 35.Which is closest to 999 ÷ 49? (a) 20 (b) 10 (c) 40 (d) 200
  36. 36.Round 94069 to the nearest hundred.
  37. 37.Round 37.76 to one decimal place. =
  38. 38.Which is closest to 202 × 79? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  39. 39.Which is closest to 608 ÷ 31? (a) 200 (b) 20 (c) 10 (d) 40
  40. 40.Which is closest to 301 + 405 + 603? (a) 1500 (b) 1200 (c) 1400 (d) 1300

Answer key

  1. 33930
  2. 40
  3. 50
  4. 20
  5. 73700
  6. 40
  7. 18000
  8. 40
  9. 70.3
  10. 70
  11. 76.4
  12. 30
  13. 99600
  14. 37.6
  15. 1800
  16. 30
  17. 45000
  18. 2100
  19. 53640
  20. 1900
  21. 20
  22. 30
  23. 18000
  24. 20
  25. 96.7
  26. 1300
  27. 6000
  28. 90
  29. 81000
  30. 85710
  31. 6000
  32. 93440
  33. 80
  34. 74.3
  35. 20
  36. 94100
  37. 37.8
  38. 16000
  39. 20
  40. 1300

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