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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 411 · 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 23669 to the nearest hundred.
  2. 2.Which is closest to 900 + 198 + 401? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  3. 3.Which is closest to 703 + 197 + 499? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  4. 4.Round 90.54 to one decimal place. =
  5. 5.Which is closest to 504 × 90? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  6. 6.Which is closest to 796 × 22? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
  7. 7.Round 73.23 to one decimal place. =
  8. 8.Round 2770 to the nearest thousand.
  9. 9.Which is closest to 607 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  10. 10.Round 93926 to the nearest thousand.
  11. 11.Round 47.26 to one decimal place. =
  12. 12.Which is closest to 298 + 398 + 699? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  13. 13.Which is closest to 803 + 295 + 196? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  14. 14.Which is closest to 198 × 52? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
  15. 15.Round 72828 to the nearest hundred.
  16. 16.Round 46.42 to one decimal place. =
  17. 17.Which is closest to 3207 ÷ 39? (a) 160 (b) 40 (c) 80 (d) 800
  18. 18.Round 42.11 to one decimal place. =
  19. 19.Which is closest to 700 × 61? (Round each number first.) (a) 4200 (b) 42000 (c) 84000 (d) 420000
  20. 20.Which is closest to 805 + 197 + 303? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  21. 21.Which is closest to 103 + 96 + 399? (a) 600 (b) 800 (c) 700 (d) 500
  22. 22.Which is closest to 605 ÷ 29? (a) 10 (b) 20 (c) 40 (d) 200
  23. 23.Which is closest to 401 × 28? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  24. 24.Which is closest to 1192 ÷ 19? (a) 30 (b) 120 (c) 60 (d) 600
  25. 25.Round 62416 to the nearest ten.
  26. 26.Round 67.19 to one decimal place. =
  27. 27.Which is closest to 595 ÷ 31? (a) 40 (b) 20 (c) 10 (d) 200
  28. 28.Round 27153 to the nearest ten.
  29. 29.Which is closest to 299 + 200 + 599? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  30. 30.Round 36512 to the nearest hundred.
  31. 31.Which is closest to 397 × 52? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
  32. 32.Which is closest to 3591 ÷ 39? (a) 45 (b) 900 (c) 180 (d) 90
  33. 33.Round 2580 to the nearest hundred.
  34. 34.Round 30.89 to one decimal place. =
  35. 35.Which is closest to 402 × 88? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  36. 36.Which is closest to 605 + 200 + 299? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  37. 37.Which is closest to 603 × 28? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  38. 38.Which is closest to 299 + 205 + 299? (a) 800 (b) 700 (c) 900 (d) 1000
  39. 39.Which is closest to 606 ÷ 19? (a) 300 (b) 15 (c) 60 (d) 30
  40. 40.Which is closest to 1208 ÷ 21? (a) 600 (b) 60 (c) 120 (d) 30

Answer key

  1. 23700
  2. 1500
  3. 1400
  4. 90.5
  5. 45000
  6. 16000
  7. 73.2
  8. 3000
  9. 30
  10. 94000
  11. 47.3
  12. 1400
  13. 1300
  14. 10000
  15. 72800
  16. 46.4
  17. 80
  18. 42.1
  19. 42000
  20. 1300
  21. 600
  22. 20
  23. 12000
  24. 60
  25. 62420
  26. 67.2
  27. 20
  28. 27150
  29. 1100
  30. 36500
  31. 20000
  32. 90
  33. 2600
  34. 30.9
  35. 36000
  36. 1100
  37. 18000
  38. 800
  39. 30
  40. 60

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