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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 101 · 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 805 + 304 + 501? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  2. 2.Round 73.61 to one decimal place. =
  3. 3.Which is closest to 399 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  4. 4.Which is closest to 402 × 62? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  5. 5.Which is closest to 801 + 197 + 705? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  6. 6.Which is closest to 400 × 48? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  7. 7.Which is closest to 396 + 105 + 201? (a) 600 (b) 800 (c) 900 (d) 700
  8. 8.Round 40.13 to one decimal place. =
  9. 9.Which is closest to 3502 ÷ 49? (a) 140 (b) 70 (c) 35 (d) 700
  10. 10.Round 44.69 to one decimal place. =
  11. 11.Which is closest to 996 ÷ 21? (a) 500 (b) 100 (c) 50 (d) 25
  12. 12.Round 66465 to the nearest thousand.
  13. 13.Round 88545 to the nearest thousand.
  14. 14.Which is closest to 1795 ÷ 29? (a) 120 (b) 600 (c) 30 (d) 60
  15. 15.Which is closest to 1007 ÷ 19? (a) 500 (b) 25 (c) 50 (d) 100
  16. 16.Which is closest to 1796 ÷ 31? (a) 600 (b) 120 (c) 30 (d) 60
  17. 17.Round 10.64 to one decimal place. =
  18. 18.Which is closest to 705 + 696 + 897? (a) 2300 (b) 2200 (c) 2500 (d) 2400
  19. 19.Round 30373 to the nearest thousand.
  20. 20.Round 96798 to the nearest hundred.
  21. 21.Round 36.34 to one decimal place. =
  22. 22.Round 34.17 to one decimal place. =
  23. 23.Which is closest to 993 ÷ 51? (a) 40 (b) 10 (c) 200 (d) 20
  24. 24.Which is closest to 1796 ÷ 19? (a) 90 (b) 900 (c) 45 (d) 180
  25. 25.Which is closest to 200 + 905 + 195? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  26. 26.Round 45.91 to one decimal place. =
  27. 27.Round 80303 to the nearest ten.
  28. 28.Which is closest to 1595 ÷ 19? (a) 800 (b) 80 (c) 160 (d) 40
  29. 29.Which is closest to 696 + 200 + 698? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  30. 30.Which is closest to 2393 ÷ 31? (a) 800 (b) 160 (c) 40 (d) 80
  31. 31.Round 60.92 to one decimal place. =
  32. 32.Round 90438 to the nearest ten.
  33. 33.Which is closest to 897 × 31? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  34. 34.Which is closest to 204 + 196 + 399? (a) 800 (b) 900 (c) 700 (d) 1000
  35. 35.Which is closest to 3498 ÷ 51? (a) 140 (b) 70 (c) 700 (d) 35
  36. 36.Round 15.22 to one decimal place. =
  37. 37.Which is closest to 801 × 68? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  38. 38.Round 78969 to the nearest hundred.
  39. 39.Round 34.18 to one decimal place. =
  40. 40.Which is closest to 200 × 21? (Round each number first.) (a) 8000 (b) 400 (c) 40000 (d) 4000

Answer key

  1. 1600
  2. 73.6
  3. 20
  4. 24000
  5. 1700
  6. 20000
  7. 700
  8. 40.1
  9. 70
  10. 44.7
  11. 50
  12. 66000
  13. 89000
  14. 60
  15. 50
  16. 60
  17. 10.6
  18. 2300
  19. 30000
  20. 96800
  21. 36.3
  22. 34.2
  23. 20
  24. 90
  25. 1300
  26. 45.9
  27. 80300
  28. 80
  29. 1600
  30. 80
  31. 60.9
  32. 90440
  33. 27000
  34. 800
  35. 70
  36. 15.2
  37. 56000
  38. 79000
  39. 34.2
  40. 4000

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