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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 655 · 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 601 × 40? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  2. 2.Which is closest to 402 × 80? (Round each number first.) (a) 3200 (b) 64000 (c) 32000 (d) 320000
  3. 3.Round 53.41 to one decimal place. =
  4. 4.Which is closest to 197 × 30? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  5. 5.Round 15680 to the nearest hundred.
  6. 6.Which is closest to 196 × 58? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  7. 7.Which is closest to 496 + 502 + 297? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  8. 8.Which is closest to 499 × 50? (Round each number first.) (a) 250000 (b) 50000 (c) 25000 (d) 2500
  9. 9.Which is closest to 796 + 695 + 498? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  10. 10.Which is closest to 296 × 79? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  11. 11.Round 41.51 to one decimal place. =
  12. 12.Which is closest to 2699 ÷ 29? (a) 900 (b) 90 (c) 180 (d) 45
  13. 13.Which is closest to 804 + 205 + 401? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  14. 14.Round 29.64 to one decimal place. =
  15. 15.Round 50960 to the nearest thousand.
  16. 16.Which is closest to 900 × 61? (Round each number first.) (a) 540000 (b) 54000 (c) 5400 (d) 108000
  17. 17.Round 73951 to the nearest ten.
  18. 18.Which is closest to 3205 ÷ 39? (a) 40 (b) 160 (c) 800 (d) 80
  19. 19.Round 79.66 to one decimal place. =
  20. 20.Round 88.83 to one decimal place. =
  21. 21.Which is closest to 497 + 398 + 199? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  22. 22.Which is closest to 2103 ÷ 29? (a) 700 (b) 140 (c) 70 (d) 35
  23. 23.Round 92.66 to one decimal place. =
  24. 24.Round 20.29 to one decimal place. =
  25. 25.Round 98.68 to one decimal place. =
  26. 26.Which is closest to 697 × 21? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  27. 27.Which is closest to 698 × 59? (Round each number first.) (a) 420000 (b) 84000 (c) 4200 (d) 42000
  28. 28.Which is closest to 801 × 80? (Round each number first.) (a) 64000 (b) 640000 (c) 6400 (d) 128000
  29. 29.Round 79843 to the nearest thousand.
  30. 30.Which is closest to 3202 ÷ 39? (a) 40 (b) 800 (c) 80 (d) 160
  31. 31.Round 42.67 to one decimal place. =
  32. 32.Which is closest to 600 + 105 + 403? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  33. 33.Which is closest to 3004 ÷ 49? (a) 30 (b) 120 (c) 600 (d) 60
  34. 34.Which is closest to 496 + 902 + 601? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  35. 35.Round 64.47 to one decimal place. =
  36. 36.Round 28834 to the nearest ten.
  37. 37.Which is closest to 1606 ÷ 39? (a) 40 (b) 80 (c) 20 (d) 400
  38. 38.Which is closest to 196 + 101 + 898? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  39. 39.Round 31.39 to one decimal place. =
  40. 40.Which is closest to 3204 ÷ 41? (a) 800 (b) 40 (c) 80 (d) 160

Answer key

  1. 24000
  2. 32000
  3. 53.4
  4. 6000
  5. 15700
  6. 12000
  7. 1300
  8. 25000
  9. 2000
  10. 24000
  11. 41.5
  12. 90
  13. 1400
  14. 29.6
  15. 51000
  16. 54000
  17. 73950
  18. 80
  19. 79.7
  20. 88.8
  21. 1100
  22. 70
  23. 92.7
  24. 20.3
  25. 98.7
  26. 14000
  27. 42000
  28. 64000
  29. 80000
  30. 80
  31. 42.7
  32. 1100
  33. 60
  34. 2000
  35. 64.5
  36. 28830
  37. 40
  38. 1200
  39. 31.4
  40. 80

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