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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 764 · 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.Round 99994 to the nearest ten.
  2. 2.Which is closest to 500 × 32? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  3. 3.Which is closest to 895 ÷ 31? (a) 30 (b) 300 (c) 15 (d) 60
  4. 4.Round 47.26 to one decimal place. =
  5. 5.Which is closest to 297 × 32? (Round each number first.) (a) 900 (b) 90000 (c) 9000 (d) 18000
  6. 6.Round 53.62 to one decimal place. =
  7. 7.Round 51306 to the nearest hundred.
  8. 8.Which is closest to 603 × 30? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  9. 9.Which is closest to 1600 ÷ 21? (a) 160 (b) 80 (c) 800 (d) 40
  10. 10.Round 43693 to the nearest thousand.
  11. 11.Round 20603 to the nearest ten.
  12. 12.Which is closest to 797 + 497 + 205? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  13. 13.Round 24916 to the nearest hundred.
  14. 14.Round 43447 to the nearest hundred.
  15. 15.Which is closest to 1493 ÷ 49? (a) 15 (b) 30 (c) 300 (d) 60
  16. 16.Which is closest to 804 × 79? (Round each number first.) (a) 128000 (b) 6400 (c) 640000 (d) 64000
  17. 17.Round 43.18 to one decimal place. =
  18. 18.Which is closest to 3997 ÷ 49? (a) 160 (b) 80 (c) 40 (d) 800
  19. 19.Which is closest to 598 + 602 + 904? (a) 2000 (b) 2100 (c) 2300 (d) 2200
  20. 20.Which is closest to 804 × 32? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  21. 21.Which is closest to 199 + 405 + 501? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  22. 22.Round 50.17 to one decimal place. =
  23. 23.Which is closest to 400 + 604 + 396? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  24. 24.Which is closest to 799 × 79? (Round each number first.) (a) 6400 (b) 64000 (c) 128000 (d) 640000
  25. 25.Which is closest to 796 + 698 + 804? (a) 2400 (b) 2300 (c) 2200 (d) 2500
  26. 26.Round 94.18 to one decimal place. =
  27. 27.Which is closest to 402 × 80? (Round each number first.) (a) 3200 (b) 320000 (c) 64000 (d) 32000
  28. 28.Round 59.67 to one decimal place. =
  29. 29.Which is closest to 902 × 32? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  30. 30.Round 83614 to the nearest ten.
  31. 31.Round 79553 to the nearest hundred.
  32. 32.Which is closest to 205 + 105 + 902? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  33. 33.Round 98.29 to one decimal place. =
  34. 34.Round 49.48 to one decimal place. =
  35. 35.Which is closest to 600 × 52? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  36. 36.Which is closest to 498 × 72? (Round each number first.) (a) 35000 (b) 70000 (c) 3500 (d) 350000
  37. 37.Round 63304 to the nearest hundred.
  38. 38.Which is closest to 2801 ÷ 41? (a) 35 (b) 140 (c) 70 (d) 700
  39. 39.Which is closest to 397 × 72? (Round each number first.) (a) 56000 (b) 280000 (c) 2800 (d) 28000
  40. 40.Round 1082 to the nearest hundred.

Answer key

  1. 99990
  2. 15000
  3. 30
  4. 47.3
  5. 9000
  6. 53.6
  7. 51300
  8. 18000
  9. 80
  10. 44000
  11. 20600
  12. 1500
  13. 24900
  14. 43400
  15. 30
  16. 64000
  17. 43.2
  18. 80
  19. 2100
  20. 24000
  21. 1100
  22. 50.2
  23. 1400
  24. 64000
  25. 2300
  26. 94.2
  27. 32000
  28. 59.7
  29. 27000
  30. 83610
  31. 79600
  32. 1200
  33. 98.3
  34. 49.5
  35. 30000
  36. 35000
  37. 63300
  38. 70
  39. 28000
  40. 1100

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