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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 50 · 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 895 ÷ 31? (a) 15 (b) 60 (c) 300 (d) 30
  2. 2.Round 4425 to the nearest thousand.
  3. 3.Which is closest to 299 + 104 + 502? (a) 1000 (b) 1100 (c) 900 (d) 800
  4. 4.Round 21152 to the nearest hundred.
  5. 5.Round 14397 to the nearest hundred.
  6. 6.Which is closest to 992 ÷ 49? (a) 10 (b) 40 (c) 200 (d) 20
  7. 7.Round 67978 to the nearest hundred.
  8. 8.Round 89464 to the nearest hundred.
  9. 9.Which is closest to 199 × 32? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  10. 10.Round 60.07 to one decimal place. =
  11. 11.Which is closest to 302 × 59? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  12. 12.Which is closest to 1207 ÷ 21? (a) 120 (b) 60 (c) 600 (d) 30
  13. 13.Which is closest to 200 × 18? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  14. 14.Which is closest to 400 × 21? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
  15. 15.Round 99134 to the nearest ten.
  16. 16.Which is closest to 299 × 29? (Round each number first.) (a) 900 (b) 18000 (c) 90000 (d) 9000
  17. 17.Which is closest to 499 × 88? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
  18. 18.Round 66023 to the nearest hundred.
  19. 19.Round 63549 to the nearest thousand.
  20. 20.Which is closest to 1199 ÷ 21? (a) 60 (b) 600 (c) 120 (d) 30
  21. 21.Round 32.16 to one decimal place. =
  22. 22.Which is closest to 395 + 604 + 502? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  23. 23.Which is closest to 404 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
  24. 24.Round 95.23 to one decimal place. =
  25. 25.Which is closest to 1594 ÷ 41? (a) 40 (b) 80 (c) 20 (d) 400
  26. 26.Which is closest to 4005 ÷ 49? (a) 800 (b) 160 (c) 80 (d) 40
  27. 27.Which is closest to 396 ÷ 19? (a) 10 (b) 40 (c) 20 (d) 200
  28. 28.Round 88011 to the nearest thousand.
  29. 29.Round 20.12 to one decimal place. =
  30. 30.Round 86.21 to one decimal place. =
  31. 31.Round 94.56 to one decimal place. =
  32. 32.Round 98242 to the nearest ten.
  33. 33.Round 99.57 to one decimal place. =
  34. 34.Round 84.12 to one decimal place. =
  35. 35.Which is closest to 496 × 31? (Round each number first.) (a) 30000 (b) 15000 (c) 1500 (d) 150000
  36. 36.Round 14842 to the nearest ten.
  37. 37.Which is closest to 804 × 89? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  38. 38.Which is closest to 205 + 505 + 600? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  39. 39.Which is closest to 404 × 68? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  40. 40.Round 78.81 to one decimal place. =

Answer key

  1. 30
  2. 4000
  3. 900
  4. 21200
  5. 14400
  6. 20
  7. 68000
  8. 89500
  9. 6000
  10. 60.1
  11. 18000
  12. 60
  13. 4000
  14. 8000
  15. 99130
  16. 9000
  17. 45000
  18. 66000
  19. 64000
  20. 60
  21. 32.2
  22. 1500
  23. 20
  24. 95.2
  25. 40
  26. 80
  27. 20
  28. 88000
  29. 20.1
  30. 86.2
  31. 94.6
  32. 98240
  33. 99.6
  34. 84.1
  35. 15000
  36. 14840
  37. 72000
  38. 1300
  39. 28000
  40. 78.8

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