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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 839 · 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 202 × 22? (Round each number first.) (a) 4000 (b) 400 (c) 40000 (d) 8000
  2. 2.Which is closest to 606 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  3. 3.Which is closest to 1205 ÷ 21? (a) 120 (b) 600 (c) 60 (d) 30
  4. 4.Which is closest to 2493 ÷ 49? (a) 100 (b) 500 (c) 25 (d) 50
  5. 5.Which is closest to 204 × 32? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  6. 6.Which is closest to 302 × 68? (Round each number first.) (a) 210000 (b) 21000 (c) 42000 (d) 2100
  7. 7.Which is closest to 2806 ÷ 41? (a) 700 (b) 140 (c) 35 (d) 70
  8. 8.Round 70.57 to one decimal place. =
  9. 9.Which is closest to 608 ÷ 29? (a) 20 (b) 200 (c) 10 (d) 40
  10. 10.Round 44.81 to one decimal place. =
  11. 11.Which is closest to 205 + 400 + 195? (a) 700 (b) 800 (c) 900 (d) 1000
  12. 12.Which is closest to 396 × 40? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  13. 13.Which is closest to 397 × 30? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  14. 14.Which is closest to 303 + 301 + 395? (a) 1000 (b) 1100 (c) 1200 (d) 900
  15. 15.Which is closest to 604 + 799 + 799? (a) 2300 (b) 2400 (c) 2200 (d) 2100
  16. 16.Which is closest to 700 + 595 + 398? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  17. 17.Which is closest to 203 × 38? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
  18. 18.Which is closest to 905 + 98 + 397? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  19. 19.Which is closest to 196 × 30? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  20. 20.Which is closest to 2095 ÷ 31? (a) 35 (b) 700 (c) 70 (d) 140
  21. 21.Which is closest to 901 × 28? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  22. 22.Which is closest to 297 × 29? (Round each number first.) (a) 9000 (b) 90000 (c) 18000 (d) 900
  23. 23.Which is closest to 904 + 397 + 896? (a) 2300 (b) 2400 (c) 2200 (d) 2100
  24. 24.Which is closest to 196 × 20? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  25. 25.Which is closest to 202 + 696 + 698? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  26. 26.Round 90.41 to one decimal place. =
  27. 27.Which is closest to 802 × 50? (Round each number first.) (a) 40000 (b) 400000 (c) 4000 (d) 80000
  28. 28.Which is closest to 296 × 52? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  29. 29.Round 45.73 to one decimal place. =
  30. 30.Round 52.43 to one decimal place. =
  31. 31.Which is closest to 499 + 303 + 701? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  32. 32.Round 81.88 to one decimal place. =
  33. 33.Round 16.29 to one decimal place. =
  34. 34.Round 53.09 to one decimal place. =
  35. 35.Which is closest to 397 + 99 + 903? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  36. 36.Round 66.43 to one decimal place. =
  37. 37.Which is closest to 600 × 31? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  38. 38.Which is closest to 1195 ÷ 29? (a) 20 (b) 40 (c) 80 (d) 400
  39. 39.Which is closest to 1004 ÷ 51? (a) 200 (b) 10 (c) 40 (d) 20
  40. 40.Round 58.29 to one decimal place. =

Answer key

  1. 4000
  2. 30
  3. 60
  4. 50
  5. 6000
  6. 21000
  7. 70
  8. 70.6
  9. 20
  10. 44.8
  11. 800
  12. 16000
  13. 12000
  14. 1000
  15. 2200
  16. 1700
  17. 8000
  18. 1400
  19. 6000
  20. 70
  21. 27000
  22. 9000
  23. 2200
  24. 4000
  25. 1600
  26. 90.4
  27. 40000
  28. 15000
  29. 45.7
  30. 52.4
  31. 1500
  32. 81.9
  33. 16.3
  34. 53.1
  35. 1400
  36. 66.4
  37. 18000
  38. 40
  39. 20
  40. 58.3

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