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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 20 · 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 398 × 32? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  2. 2.Which is closest to 898 × 39? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  3. 3.Round 50.41 to one decimal place. =
  4. 4.Round 85.86 to one decimal place. =
  5. 5.Round 12.11 to one decimal place. =
  6. 6.Which is closest to 1491 ÷ 49? (a) 15 (b) 30 (c) 60 (d) 300
  7. 7.Which is closest to 599 × 39? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  8. 8.Which is closest to 702 + 199 + 297? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  9. 9.Which is closest to 805 + 500 + 100? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  10. 10.Which is closest to 697 × 58? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  11. 11.Which is closest to 698 × 69? (Round each number first.) (a) 490000 (b) 4900 (c) 49000 (d) 98000
  12. 12.Round 31.69 to one decimal place. =
  13. 13.Which is closest to 900 × 22? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  14. 14.Which is closest to 498 × 42? (Round each number first.) (a) 20000 (b) 200000 (c) 40000 (d) 2000
  15. 15.Which is closest to 498 + 197 + 600? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  16. 16.Round 47018 to the nearest thousand.
  17. 17.Which is closest to 299 × 52? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  18. 18.Which is closest to 2993 ÷ 49? (a) 120 (b) 60 (c) 600 (d) 30
  19. 19.Which is closest to 1392 ÷ 19? (a) 70 (b) 140 (c) 700 (d) 35
  20. 20.Round 46933 to the nearest ten.
  21. 21.Which is closest to 1600 ÷ 19? (a) 80 (b) 160 (c) 40 (d) 800
  22. 22.Round 51.84 to one decimal place. =
  23. 23.Which is closest to 801 + 300 + 298? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  24. 24.Which is closest to 897 × 52? (Round each number first.) (a) 4500 (b) 45000 (c) 90000 (d) 450000
  25. 25.Which is closest to 397 + 300 + 596? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  26. 26.Round 94.09 to one decimal place. =
  27. 27.Round 82567 to the nearest ten.
  28. 28.Which is closest to 2698 ÷ 29? (a) 900 (b) 45 (c) 90 (d) 180
  29. 29.Round 46.37 to one decimal place. =
  30. 30.Round 65956 to the nearest thousand.
  31. 31.Which is closest to 594 ÷ 31? (a) 200 (b) 10 (c) 40 (d) 20
  32. 32.Round 6887 to the nearest hundred.
  33. 33.Which is closest to 902 × 49? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  34. 34.Round 20677 to the nearest ten.
  35. 35.Round 8029 to the nearest thousand.
  36. 36.Which is closest to 295 + 804 + 195? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  37. 37.Round 56400 to the nearest thousand.
  38. 38.Round 34736 to the nearest hundred.
  39. 39.Which is closest to 599 + 305 + 196? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  40. 40.Which is closest to 198 + 599 + 698? (a) 1400 (b) 1700 (c) 1600 (d) 1500

Answer key

  1. 12000
  2. 36000
  3. 50.4
  4. 85.9
  5. 12.1
  6. 30
  7. 24000
  8. 1200
  9. 1400
  10. 42000
  11. 49000
  12. 31.7
  13. 18000
  14. 20000
  15. 1300
  16. 47000
  17. 15000
  18. 60
  19. 70
  20. 46930
  21. 80
  22. 51.8
  23. 1400
  24. 45000
  25. 1300
  26. 94.1
  27. 82570
  28. 90
  29. 46.4
  30. 66000
  31. 20
  32. 6900
  33. 45000
  34. 20680
  35. 8000
  36. 1300
  37. 56000
  38. 34700
  39. 1100
  40. 1500

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