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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 820 · 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 1198 ÷ 41? (a) 30 (b) 60 (c) 300 (d) 15
  2. 2.Which is closest to 900 × 28? (Round each number first.) (a) 270000 (b) 54000 (c) 2700 (d) 27000
  3. 3.Round 36.16 to one decimal place. =
  4. 4.Which is closest to 500 × 19? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  5. 5.Which is closest to 705 + 502 + 205? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  6. 6.Which is closest to 501 × 79? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  7. 7.Round 30.21 to one decimal place. =
  8. 8.Round 65.44 to one decimal place. =
  9. 9.Which is closest to 700 × 41? (Round each number first.) (a) 280000 (b) 56000 (c) 28000 (d) 2800
  10. 10.Round 21.84 to one decimal place. =
  11. 11.Which is closest to 895 ÷ 31? (a) 15 (b) 30 (c) 60 (d) 300
  12. 12.Which is closest to 196 × 79? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  13. 13.Round 91261 to the nearest hundred.
  14. 14.Which is closest to 1607 ÷ 39? (a) 20 (b) 80 (c) 400 (d) 40
  15. 15.Which is closest to 399 × 88? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  16. 16.Which is closest to 1194 ÷ 29? (a) 80 (b) 40 (c) 400 (d) 20
  17. 17.Round 33889 to the nearest hundred.
  18. 18.Which is closest to 4506 ÷ 49? (a) 45 (b) 180 (c) 90 (d) 900
  19. 19.Round 17644 to the nearest hundred.
  20. 20.Which is closest to 902 × 19? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  21. 21.Which is closest to 1209 ÷ 39? (a) 300 (b) 60 (c) 30 (d) 15
  22. 22.Which is closest to 3608 ÷ 41? (a) 900 (b) 90 (c) 45 (d) 180
  23. 23.Round 43622 to the nearest hundred.
  24. 24.Round 27459 to the nearest thousand.
  25. 25.Which is closest to 1597 ÷ 19? (a) 160 (b) 40 (c) 800 (d) 80
  26. 26.Which is closest to 396 × 42? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  27. 27.Which is closest to 899 ÷ 31? (a) 300 (b) 15 (c) 30 (d) 60
  28. 28.Round 22869 to the nearest ten.
  29. 29.Which is closest to 2406 ÷ 39? (a) 600 (b) 30 (c) 120 (d) 60
  30. 30.Which is closest to 196 × 88? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  31. 31.Round 27.26 to one decimal place. =
  32. 32.Which is closest to 1997 ÷ 49? (a) 40 (b) 80 (c) 20 (d) 400
  33. 33.Which is closest to 403 × 40? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  34. 34.Which is closest to 895 + 796 + 604? (a) 2300 (b) 2500 (c) 2200 (d) 2400
  35. 35.Which is closest to 899 + 904 + 597? (a) 2500 (b) 2400 (c) 2600 (d) 2300
  36. 36.Round 39758 to the nearest ten.
  37. 37.Round 18539 to the nearest hundred.
  38. 38.Round 85.57 to one decimal place. =
  39. 39.Which is closest to 2495 ÷ 51? (a) 100 (b) 500 (c) 25 (d) 50
  40. 40.Which is closest to 302 × 69? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000

Answer key

  1. 30
  2. 27000
  3. 36.2
  4. 10000
  5. 1400
  6. 40000
  7. 30.2
  8. 65.4
  9. 28000
  10. 21.8
  11. 30
  12. 16000
  13. 91300
  14. 40
  15. 36000
  16. 40
  17. 33900
  18. 90
  19. 17600
  20. 18000
  21. 30
  22. 90
  23. 43600
  24. 27000
  25. 80
  26. 16000
  27. 30
  28. 22870
  29. 60
  30. 18000
  31. 27.3
  32. 40
  33. 16000
  34. 2300
  35. 2400
  36. 39760
  37. 18500
  38. 85.6
  39. 50
  40. 21000

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