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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 984 · 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 504 × 38? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  2. 2.Which is closest to 103 + 302 + 97? (a) 600 (b) 700 (c) 400 (d) 500
  3. 3.Which is closest to 3998 ÷ 51? (a) 160 (b) 800 (c) 80 (d) 40
  4. 4.Round 80.22 to one decimal place. =
  5. 5.Round 66753 to the nearest hundred.
  6. 6.Round 96.13 to one decimal place. =
  7. 7.Which is closest to 599 × 40? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  8. 8.Round 83.78 to one decimal place. =
  9. 9.Which is closest to 803 × 70? (Round each number first.) (a) 56000 (b) 112000 (c) 5600 (d) 560000
  10. 10.Round 64.51 to one decimal place. =
  11. 11.Round 98524 to the nearest hundred.
  12. 12.Which is closest to 806 ÷ 19? (a) 20 (b) 400 (c) 40 (d) 80
  13. 13.Which is closest to 3594 ÷ 41? (a) 900 (b) 180 (c) 45 (d) 90
  14. 14.Which is closest to 605 + 304 + 805? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  15. 15.Which is closest to 902 + 195 + 196? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  16. 16.Round 82509 to the nearest ten.
  17. 17.Which is closest to 302 × 90? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  18. 18.Which is closest to 203 + 96 + 97? (a) 400 (b) 500 (c) 600 (d) 300
  19. 19.Round 89.44 to one decimal place. =
  20. 20.Which is closest to 1796 ÷ 29? (a) 30 (b) 600 (c) 60 (d) 120
  21. 21.Which is closest to 300 × 88? (Round each number first.) (a) 2700 (b) 54000 (c) 27000 (d) 270000
  22. 22.Which is closest to 1008 ÷ 21? (a) 25 (b) 500 (c) 100 (d) 50
  23. 23.Round 47709 to the nearest ten.
  24. 24.Which is closest to 898 × 48? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  25. 25.Which is closest to 3607 ÷ 41? (a) 45 (b) 180 (c) 900 (d) 90
  26. 26.Which is closest to 1407 ÷ 21? (a) 700 (b) 140 (c) 35 (d) 70
  27. 27.Which is closest to 300 + 705 + 200? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  28. 28.Round 14246 to the nearest ten.
  29. 29.Which is closest to 703 × 48? (Round each number first.) (a) 70000 (b) 3500 (c) 350000 (d) 35000
  30. 30.Round 86.26 to one decimal place. =
  31. 31.Which is closest to 800 × 41? (Round each number first.) (a) 32000 (b) 320000 (c) 3200 (d) 64000
  32. 32.Which is closest to 197 × 91? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  33. 33.Round 73.24 to one decimal place. =
  34. 34.Round 13504 to the nearest ten.
  35. 35.Round 4354 to the nearest thousand.
  36. 36.Which is closest to 497 × 79? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  37. 37.Which is closest to 405 + 901 + 403? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  38. 38.Which is closest to 499 × 90? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  39. 39.Round 83.29 to one decimal place. =
  40. 40.Round 85.73 to one decimal place. =

Answer key

  1. 20000
  2. 500
  3. 80
  4. 80.2
  5. 66800
  6. 96.1
  7. 24000
  8. 83.8
  9. 56000
  10. 64.5
  11. 98500
  12. 40
  13. 90
  14. 1700
  15. 1300
  16. 82510
  17. 27000
  18. 400
  19. 89.4
  20. 60
  21. 27000
  22. 50
  23. 47710
  24. 45000
  25. 90
  26. 70
  27. 1200
  28. 14250
  29. 35000
  30. 86.3
  31. 32000
  32. 18000
  33. 73.2
  34. 13500
  35. 4000
  36. 40000
  37. 1700
  38. 45000
  39. 83.3
  40. 85.7

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