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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 826 · 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 × 79? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  2. 2.Which is closest to 2405 ÷ 29? (a) 40 (b) 160 (c) 800 (d) 80
  3. 3.Which is closest to 398 + 397 + 396? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  4. 4.Which is closest to 698 × 50? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000
  5. 5.Which is closest to 697 + 795 + 296? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  6. 6.Round 86.94 to one decimal place. =
  7. 7.Which is closest to 2001 ÷ 49? (a) 80 (b) 20 (c) 40 (d) 400
  8. 8.Which is closest to 600 + 499 + 304? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  9. 9.Round 49.64 to one decimal place. =
  10. 10.Which is closest to 300 × 62? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  11. 11.Which is closest to 1798 ÷ 19? (a) 900 (b) 45 (c) 180 (d) 90
  12. 12.Which is closest to 205 + 498 + 105? (a) 800 (b) 1000 (c) 700 (d) 900
  13. 13.Round 98.82 to one decimal place. =
  14. 14.Which is closest to 897 + 199 + 502? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  15. 15.Which is closest to 800 × 71? (Round each number first.) (a) 5600 (b) 56000 (c) 560000 (d) 112000
  16. 16.Which is closest to 196 + 697 + 803? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  17. 17.Which is closest to 798 + 899 + 401? (a) 2100 (b) 2000 (c) 2300 (d) 2200
  18. 18.Which is closest to 802 × 92? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  19. 19.Round 99.09 to one decimal place. =
  20. 20.Which is closest to 403 × 49? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  21. 21.Round 52.23 to one decimal place. =
  22. 22.Which is closest to 801 × 78? (Round each number first.) (a) 128000 (b) 64000 (c) 6400 (d) 640000
  23. 23.Round 14.93 to one decimal place. =
  24. 24.Which is closest to 1791 ÷ 19? (a) 90 (b) 900 (c) 180 (d) 45
  25. 25.Round 6169 to the nearest hundred.
  26. 26.Which is closest to 503 × 30? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  27. 27.Round 39.53 to one decimal place. =
  28. 28.Round 82.33 to one decimal place. =
  29. 29.Round 97886 to the nearest hundred.
  30. 30.Which is closest to 603 × 29? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  31. 31.Round 50.68 to one decimal place. =
  32. 32.Which is closest to 900 × 88? (Round each number first.) (a) 810000 (b) 8100 (c) 81000 (d) 162000
  33. 33.Which is closest to 2399 ÷ 31? (a) 800 (b) 80 (c) 160 (d) 40
  34. 34.Which is closest to 701 + 295 + 600? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  35. 35.Round 94.73 to one decimal place. =
  36. 36.Which is closest to 197 × 72? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  37. 37.Which is closest to 703 × 29? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  38. 38.Which is closest to 701 + 300 + 198? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  39. 39.Which is closest to 598 + 705 + 698? (a) 2000 (b) 1900 (c) 2200 (d) 2100
  40. 40.Which is closest to 902 + 896 + 600? (a) 2300 (b) 2400 (c) 2500 (d) 2600

Answer key

  1. 48000
  2. 80
  3. 1200
  4. 35000
  5. 1800
  6. 86.9
  7. 40
  8. 1400
  9. 49.6
  10. 18000
  11. 90
  12. 800
  13. 98.8
  14. 1600
  15. 56000
  16. 1700
  17. 2100
  18. 72000
  19. 99.1
  20. 20000
  21. 52.2
  22. 64000
  23. 14.9
  24. 90
  25. 6200
  26. 15000
  27. 39.5
  28. 82.3
  29. 97900
  30. 18000
  31. 50.7
  32. 81000
  33. 80
  34. 1600
  35. 94.7
  36. 14000
  37. 21000
  38. 1200
  39. 2000
  40. 2400

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