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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 273 · 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 302 × 32? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
  2. 2.Which is closest to 1803 ÷ 29? (a) 30 (b) 60 (c) 120 (d) 600
  3. 3.Which is closest to 1394 ÷ 19? (a) 700 (b) 70 (c) 140 (d) 35
  4. 4.Round 99.21 to one decimal place. =
  5. 5.Which is closest to 398 × 20? (Round each number first.) (a) 8000 (b) 16000 (c) 800 (d) 80000
  6. 6.Which is closest to 600 + 399 + 401? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  7. 7.Which is closest to 2009 ÷ 41? (a) 100 (b) 500 (c) 50 (d) 25
  8. 8.Which is closest to 501 × 69? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  9. 9.Which is closest to 793 ÷ 39? (a) 40 (b) 200 (c) 20 (d) 10
  10. 10.Round 1741 to the nearest ten.
  11. 11.Round 1841 to the nearest thousand.
  12. 12.Round 49475 to the nearest hundred.
  13. 13.Which is closest to 500 × 68? (Round each number first.) (a) 70000 (b) 3500 (c) 350000 (d) 35000
  14. 14.Which is closest to 196 × 18? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  15. 15.Round 50031 to the nearest ten.
  16. 16.Round 63090 to the nearest thousand.
  17. 17.Which is closest to 796 × 81? (Round each number first.) (a) 640000 (b) 64000 (c) 6400 (d) 128000
  18. 18.Which is closest to 1496 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
  19. 19.Which is closest to 302 × 70? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  20. 20.Round 53516 to the nearest ten.
  21. 21.Round 85706 to the nearest hundred.
  22. 22.Round 45571 to the nearest thousand.
  23. 23.Round 26.28 to one decimal place. =
  24. 24.Round 5160 to the nearest hundred.
  25. 25.Round 68300 to the nearest thousand.
  26. 26.Which is closest to 2406 ÷ 39? (a) 600 (b) 30 (c) 120 (d) 60
  27. 27.Which is closest to 4001 ÷ 49? (a) 800 (b) 80 (c) 160 (d) 40
  28. 28.Which is closest to 301 × 92? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  29. 29.Which is closest to 897 ÷ 29? (a) 30 (b) 300 (c) 60 (d) 15
  30. 30.Round 38.64 to one decimal place. =
  31. 31.Which is closest to 1792 ÷ 21? (a) 180 (b) 900 (c) 90 (d) 45
  32. 32.Round 4338 to the nearest hundred.
  33. 33.Round 20.38 to one decimal place. =
  34. 34.Which is closest to 397 + 195 + 296? (a) 800 (b) 1000 (c) 1100 (d) 900
  35. 35.Which is closest to 896 ÷ 31? (a) 30 (b) 15 (c) 60 (d) 300
  36. 36.Round 35.42 to one decimal place. =
  37. 37.Which is closest to 299 × 42? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  38. 38.Round 35.46 to one decimal place. =
  39. 39.Which is closest to 198 + 495 + 396? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  40. 40.Round 86677 to the nearest thousand.

Answer key

  1. 9000
  2. 60
  3. 70
  4. 99.2
  5. 8000
  6. 1400
  7. 50
  8. 35000
  9. 20
  10. 1740
  11. 2000
  12. 49500
  13. 35000
  14. 4000
  15. 50030
  16. 63000
  17. 64000
  18. 50
  19. 21000
  20. 53520
  21. 85700
  22. 46000
  23. 26.3
  24. 5200
  25. 68000
  26. 60
  27. 80
  28. 27000
  29. 30
  30. 38.6
  31. 90
  32. 4300
  33. 20.4
  34. 900
  35. 30
  36. 35.4
  37. 12000
  38. 35.5
  39. 1100
  40. 87000

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