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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 461 · 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 62.14 to one decimal place. =
  2. 2.Round 39.19 to one decimal place. =
  3. 3.Round 81.93 to one decimal place. =
  4. 4.Which is closest to 3194 ÷ 41? (a) 80 (b) 800 (c) 160 (d) 40
  5. 5.Which is closest to 201 × 70? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  6. 6.Which is closest to 701 × 50? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  7. 7.Which is closest to 298 + 496 + 102? (a) 1000 (b) 1100 (c) 900 (d) 800
  8. 8.Which is closest to 897 ÷ 29? (a) 300 (b) 60 (c) 30 (d) 15
  9. 9.Round 79419 to the nearest ten.
  10. 10.Round 73.12 to one decimal place. =
  11. 11.Which is closest to 597 × 28? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  12. 12.Round 20.78 to one decimal place. =
  13. 13.Which is closest to 899 × 88? (Round each number first.) (a) 810000 (b) 162000 (c) 8100 (d) 81000
  14. 14.Which is closest to 4503 ÷ 49? (a) 900 (b) 45 (c) 180 (d) 90
  15. 15.Which is closest to 697 × 32? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  16. 16.Which is closest to 299 × 70? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  17. 17.Round 63.93 to one decimal place. =
  18. 18.Round 22394 to the nearest ten.
  19. 19.Round 65.67 to one decimal place. =
  20. 20.Which is closest to 301 + 701 + 301? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  21. 21.Round 66449 to the nearest thousand.
  22. 22.Which is closest to 1199 ÷ 41? (a) 60 (b) 300 (c) 30 (d) 15
  23. 23.Which is closest to 4493 ÷ 51? (a) 180 (b) 900 (c) 45 (d) 90
  24. 24.Round 68257 to the nearest thousand.
  25. 25.Round 39651 to the nearest thousand.
  26. 26.Round 41.57 to one decimal place. =
  27. 27.Which is closest to 905 + 500 + 100? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  28. 28.Which is closest to 801 × 41? (Round each number first.) (a) 3200 (b) 64000 (c) 32000 (d) 320000
  29. 29.Which is closest to 205 + 399 + 602? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  30. 30.Which is closest to 299 + 804 + 799? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  31. 31.Which is closest to 3505 ÷ 49? (a) 70 (b) 700 (c) 35 (d) 140
  32. 32.Which is closest to 901 × 50? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  33. 33.Which is closest to 609 ÷ 29? (a) 20 (b) 40 (c) 200 (d) 10
  34. 34.Which is closest to 602 × 52? (Round each number first.) (a) 3000 (b) 300000 (c) 30000 (d) 60000
  35. 35.Which is closest to 396 × 89? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  36. 36.Which is closest to 2796 ÷ 41? (a) 700 (b) 70 (c) 35 (d) 140
  37. 37.Round 29.78 to one decimal place. =
  38. 38.Round 9251 to the nearest ten.
  39. 39.Which is closest to 902 + 95 + 98? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  40. 40.Round 84.87 to one decimal place. =

Answer key

  1. 62.1
  2. 39.2
  3. 81.9
  4. 80
  5. 14000
  6. 35000
  7. 900
  8. 30
  9. 79420
  10. 73.1
  11. 18000
  12. 20.8
  13. 81000
  14. 90
  15. 21000
  16. 21000
  17. 63.9
  18. 22390
  19. 65.7
  20. 1300
  21. 66000
  22. 30
  23. 90
  24. 68000
  25. 40000
  26. 41.6
  27. 1500
  28. 32000
  29. 1200
  30. 1900
  31. 70
  32. 45000
  33. 20
  34. 30000
  35. 36000
  36. 70
  37. 29.8
  38. 9250
  39. 1100
  40. 84.9

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