← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 103 · 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 104 + 102 + 595? (a) 1000 (b) 800 (c) 900 (d) 700
  2. 2.Which is closest to 201 × 19? (Round each number first.) (a) 8000 (b) 400 (c) 4000 (d) 40000
  3. 3.Round 82.69 to one decimal place. =
  4. 4.Round 19.87 to one decimal place. =
  5. 5.Which is closest to 600 × 71? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  6. 6.Round 13.33 to one decimal place. =
  7. 7.Round 41760 to the nearest hundred.
  8. 8.Which is closest to 199 + 100 + 404? (a) 700 (b) 900 (c) 800 (d) 600
  9. 9.Which is closest to 498 × 31? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
  10. 10.Which is closest to 303 × 90? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  11. 11.Which is closest to 702 × 29? (Round each number first.) (a) 21000 (b) 2100 (c) 210000 (d) 42000
  12. 12.Which is closest to 698 × 78? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  13. 13.Round 77.88 to one decimal place. =
  14. 14.Round 80.81 to one decimal place. =
  15. 15.Round 29.57 to one decimal place. =
  16. 16.Round 21.06 to one decimal place. =
  17. 17.Which is closest to 3596 ÷ 41? (a) 180 (b) 900 (c) 90 (d) 45
  18. 18.Which is closest to 502 × 52? (Round each number first.) (a) 50000 (b) 25000 (c) 250000 (d) 2500
  19. 19.Which is closest to 804 × 30? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  20. 20.Round 11.32 to one decimal place. =
  21. 21.Round 41.23 to one decimal place. =
  22. 22.Round 18749 to the nearest hundred.
  23. 23.Round 5652 to the nearest ten.
  24. 24.Round 68.24 to one decimal place. =
  25. 25.Which is closest to 500 × 51? (Round each number first.) (a) 250000 (b) 50000 (c) 2500 (d) 25000
  26. 26.Which is closest to 200 × 29? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  27. 27.Which is closest to 302 × 32? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
  28. 28.Which is closest to 1003 ÷ 49? (a) 10 (b) 20 (c) 40 (d) 200
  29. 29.Which is closest to 399 + 196 + 296? (a) 800 (b) 1000 (c) 1100 (d) 900
  30. 30.Which is closest to 2995 ÷ 49? (a) 60 (b) 30 (c) 120 (d) 600
  31. 31.Round 59317 to the nearest hundred.
  32. 32.Round 73582 to the nearest thousand.
  33. 33.Which is closest to 901 + 905 + 195? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  34. 34.Which is closest to 403 × 89? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
  35. 35.Round 57.92 to one decimal place. =
  36. 36.Which is closest to 498 × 78? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  37. 37.Which is closest to 2709 ÷ 29? (a) 90 (b) 900 (c) 180 (d) 45
  38. 38.Which is closest to 401 + 802 + 500? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  39. 39.Round 70.33 to one decimal place. =
  40. 40.Which is closest to 901 × 40? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600

Answer key

  1. 800
  2. 4000
  3. 82.7
  4. 19.9
  5. 42000
  6. 13.3
  7. 41800
  8. 700
  9. 15000
  10. 27000
  11. 21000
  12. 56000
  13. 77.9
  14. 80.8
  15. 29.6
  16. 21.1
  17. 90
  18. 25000
  19. 24000
  20. 11.3
  21. 41.2
  22. 18700
  23. 5650
  24. 68.2
  25. 25000
  26. 6000
  27. 9000
  28. 20
  29. 900
  30. 60
  31. 59300
  32. 74000
  33. 2000
  34. 36000
  35. 57.9
  36. 40000
  37. 90
  38. 1700
  39. 70.3
  40. 36000

Free quantitative aptitude lessons, practice and worksheets at talentjr.in/quantitative-aptitude