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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 246 · 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 196 + 203 + 500? (a) 800 (b) 1100 (c) 1000 (d) 900
  2. 2.Which is closest to 2509 ÷ 51? (a) 500 (b) 100 (c) 50 (d) 25
  3. 3.Which is closest to 804 × 29? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  4. 4.Round 25.07 to one decimal place. =
  5. 5.Which is closest to 305 + 300 + 398? (a) 1200 (b) 1000 (c) 900 (d) 1100
  6. 6.Which is closest to 4004 ÷ 51? (a) 800 (b) 40 (c) 160 (d) 80
  7. 7.Which is closest to 791 ÷ 19? (a) 40 (b) 80 (c) 20 (d) 400
  8. 8.Round 26.56 to one decimal place. =
  9. 9.Round 65096 to the nearest hundred.
  10. 10.Round 97.59 to one decimal place. =
  11. 11.Which is closest to 3197 ÷ 39? (a) 800 (b) 40 (c) 80 (d) 160
  12. 12.Round 46.71 to one decimal place. =
  13. 13.Which is closest to 3498 ÷ 51? (a) 700 (b) 70 (c) 35 (d) 140
  14. 14.Which is closest to 695 + 298 + 603? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  15. 15.Which is closest to 1402 ÷ 21? (a) 140 (b) 700 (c) 70 (d) 35
  16. 16.Round 59.17 to one decimal place. =
  17. 17.Which is closest to 597 × 70? (Round each number first.) (a) 42000 (b) 84000 (c) 420000 (d) 4200
  18. 18.Which is closest to 803 × 28? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  19. 19.Which is closest to 195 + 798 + 104? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  20. 20.Which is closest to 297 × 68? (Round each number first.) (a) 21000 (b) 210000 (c) 42000 (d) 2100
  21. 21.Which is closest to 398 × 69? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  22. 22.Which is closest to 698 + 901 + 600? (a) 2100 (b) 2400 (c) 2200 (d) 2300
  23. 23.Which is closest to 898 × 90? (Round each number first.) (a) 8100 (b) 810000 (c) 81000 (d) 162000
  24. 24.Which is closest to 894 ÷ 31? (a) 30 (b) 300 (c) 15 (d) 60
  25. 25.Which is closest to 797 × 21? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  26. 26.Which is closest to 598 + 403 + 99? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  27. 27.Which is closest to 1603 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  28. 28.Round 25.61 to one decimal place. =
  29. 29.Which is closest to 301 + 304 + 505? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  30. 30.Round 21.76 to one decimal place. =
  31. 31.Which is closest to 801 + 297 + 197? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  32. 32.Which is closest to 205 + 101 + 701? (a) 900 (b) 1100 (c) 1000 (d) 1200
  33. 33.Which is closest to 302 × 40? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  34. 34.Which is closest to 499 × 20? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  35. 35.Round 93.67 to one decimal place. =
  36. 36.Which is closest to 1605 ÷ 39? (a) 20 (b) 80 (c) 40 (d) 400
  37. 37.Round 31548 to the nearest thousand.
  38. 38.Round 91.23 to one decimal place. =
  39. 39.Which is closest to 605 ÷ 31? (a) 200 (b) 40 (c) 20 (d) 10
  40. 40.Which is closest to 1494 ÷ 29? (a) 25 (b) 500 (c) 100 (d) 50

Answer key

  1. 900
  2. 50
  3. 24000
  4. 25.1
  5. 1000
  6. 80
  7. 40
  8. 26.6
  9. 65100
  10. 97.6
  11. 80
  12. 46.7
  13. 70
  14. 1600
  15. 70
  16. 59.2
  17. 42000
  18. 24000
  19. 1100
  20. 21000
  21. 28000
  22. 2200
  23. 81000
  24. 30
  25. 16000
  26. 1100
  27. 40
  28. 25.6
  29. 1100
  30. 21.8
  31. 1300
  32. 1000
  33. 12000
  34. 10000
  35. 93.7
  36. 40
  37. 32000
  38. 91.2
  39. 20
  40. 50

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