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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 138 · 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 701 × 88? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  2. 2.Which is closest to 896 + 304 + 696? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  3. 3.Which is closest to 1995 ÷ 39? (a) 500 (b) 100 (c) 50 (d) 25
  4. 4.Which is closest to 705 + 502 + 199? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  5. 5.Round 60846 to the nearest hundred.
  6. 6.Which is closest to 899 × 40? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  7. 7.Which is closest to 500 + 695 + 695? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  8. 8.Which is closest to 203 × 69? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  9. 9.Which is closest to 799 × 90? (Round each number first.) (a) 7200 (b) 72000 (c) 720000 (d) 144000
  10. 10.Which is closest to 96 + 295 + 195? (a) 600 (b) 800 (c) 500 (d) 700
  11. 11.Which is closest to 605 ÷ 19? (a) 15 (b) 60 (c) 30 (d) 300
  12. 12.Which is closest to 695 + 795 + 199? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  13. 13.Which is closest to 398 × 69? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  14. 14.Which is closest to 1191 ÷ 31? (a) 80 (b) 40 (c) 400 (d) 20
  15. 15.Round 41.21 to one decimal place. =
  16. 16.Round 72332 to the nearest thousand.
  17. 17.Round 23.49 to one decimal place. =
  18. 18.Round 16.36 to one decimal place. =
  19. 19.Which is closest to 608 ÷ 19? (a) 60 (b) 300 (c) 30 (d) 15
  20. 20.Round 12.82 to one decimal place. =
  21. 21.Which is closest to 803 + 698 + 505? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  22. 22.Round 39.23 to one decimal place. =
  23. 23.Round 25.42 to one decimal place. =
  24. 24.Which is closest to 3599 ÷ 41? (a) 90 (b) 45 (c) 900 (d) 180
  25. 25.Round 12.77 to one decimal place. =
  26. 26.Round 65.66 to one decimal place. =
  27. 27.Which is closest to 1793 ÷ 19? (a) 900 (b) 45 (c) 180 (d) 90
  28. 28.Round 74.14 to one decimal place. =
  29. 29.Round 52332 to the nearest ten.
  30. 30.Round 54.33 to one decimal place. =
  31. 31.Which is closest to 1500 ÷ 29? (a) 100 (b) 500 (c) 25 (d) 50
  32. 32.Round 16240 to the nearest hundred.
  33. 33.Which is closest to 795 ÷ 41? (a) 200 (b) 40 (c) 20 (d) 10
  34. 34.Which is closest to 702 × 90? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  35. 35.Round 74.64 to one decimal place. =
  36. 36.Which is closest to 3493 ÷ 49? (a) 700 (b) 70 (c) 35 (d) 140
  37. 37.Which is closest to 2795 ÷ 41? (a) 70 (b) 140 (c) 700 (d) 35
  38. 38.Which is closest to 795 ÷ 39? (a) 200 (b) 20 (c) 40 (d) 10
  39. 39.Round 28.22 to one decimal place. =
  40. 40.Which is closest to 304 × 71? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100

Answer key

  1. 63000
  2. 1900
  3. 50
  4. 1400
  5. 60800
  6. 36000
  7. 1900
  8. 14000
  9. 72000
  10. 600
  11. 30
  12. 1700
  13. 28000
  14. 40
  15. 41.2
  16. 72000
  17. 23.5
  18. 16.4
  19. 30
  20. 12.8
  21. 2000
  22. 39.2
  23. 25.4
  24. 90
  25. 12.8
  26. 65.7
  27. 90
  28. 74.1
  29. 52330
  30. 54.3
  31. 50
  32. 16200
  33. 20
  34. 63000
  35. 74.6
  36. 70
  37. 70
  38. 20
  39. 28.2
  40. 21000

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