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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 770 · 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 298 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000
  2. 2.Which is closest to 704 × 78? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  3. 3.Which is closest to 3992 ÷ 49? (a) 80 (b) 800 (c) 40 (d) 160
  4. 4.Round 12232 to the nearest hundred.
  5. 5.Round 81.87 to one decimal place. =
  6. 6.Which is closest to 203 × 30? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  7. 7.Which is closest to 697 + 398 + 195? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  8. 8.Round 81.23 to one decimal place. =
  9. 9.Which is closest to 401 × 71? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  10. 10.Which is closest to 795 ÷ 41? (a) 200 (b) 10 (c) 40 (d) 20
  11. 11.Which is closest to 998 ÷ 21? (a) 25 (b) 100 (c) 500 (d) 50
  12. 12.Round 94352 to the nearest thousand.
  13. 13.Round 34.67 to one decimal place. =
  14. 14.Round 1006 to the nearest thousand.
  15. 15.Which is closest to 301 × 82? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  16. 16.Which is closest to 496 × 72? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  17. 17.Which is closest to 1598 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  18. 18.Which is closest to 697 + 295 + 304? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  19. 19.Round 56.27 to one decimal place. =
  20. 20.Which is closest to 899 × 81? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  21. 21.Which is closest to 3591 ÷ 41? (a) 90 (b) 180 (c) 900 (d) 45
  22. 22.Round 51963 to the nearest thousand.
  23. 23.Which is closest to 1805 ÷ 31? (a) 60 (b) 120 (c) 30 (d) 600
  24. 24.Round 64.34 to one decimal place. =
  25. 25.Which is closest to 402 ÷ 19? (a) 20 (b) 40 (c) 10 (d) 200
  26. 26.Round 37.48 to one decimal place. =
  27. 27.Which is closest to 1500 ÷ 49? (a) 60 (b) 30 (c) 15 (d) 300
  28. 28.Round 12399 to the nearest ten.
  29. 29.Round 24.82 to one decimal place. =
  30. 30.Which is closest to 3993 ÷ 51? (a) 80 (b) 160 (c) 800 (d) 40
  31. 31.Round 72.58 to one decimal place. =
  32. 32.Which is closest to 102 + 896 + 698? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  33. 33.Which is closest to 2501 ÷ 51? (a) 100 (b) 500 (c) 50 (d) 25
  34. 34.Round 50.38 to one decimal place. =
  35. 35.Which is closest to 400 × 21? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  36. 36.Round 7414 to the nearest hundred.
  37. 37.Which is closest to 1408 ÷ 19? (a) 70 (b) 35 (c) 700 (d) 140
  38. 38.Round 43816 to the nearest ten.
  39. 39.Which is closest to 503 × 82? (Round each number first.) (a) 4000 (b) 400000 (c) 40000 (d) 80000
  40. 40.Which is closest to 1193 ÷ 29? (a) 40 (b) 20 (c) 80 (d) 400

Answer key

  1. 6000
  2. 56000
  3. 80
  4. 12200
  5. 81.9
  6. 6000
  7. 1300
  8. 81.2
  9. 28000
  10. 20
  11. 50
  12. 94000
  13. 34.7
  14. 1000
  15. 24000
  16. 35000
  17. 80
  18. 1300
  19. 56.3
  20. 72000
  21. 90
  22. 52000
  23. 60
  24. 64.3
  25. 20
  26. 37.5
  27. 30
  28. 12400
  29. 24.8
  30. 80
  31. 72.6
  32. 1700
  33. 50
  34. 50.4
  35. 8000
  36. 7400
  37. 70
  38. 43820
  39. 40000
  40. 40

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