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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 346 · 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 297 × 79? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  2. 2.Round 12604 to the nearest thousand.
  3. 3.Round 42584 to the nearest hundred.
  4. 4.Which is closest to 797 ÷ 39? (a) 10 (b) 40 (c) 20 (d) 200
  5. 5.Round 14342 to the nearest hundred.
  6. 6.Which is closest to 600 × 49? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  7. 7.Which is closest to 402 + 198 + 296? (a) 1100 (b) 1000 (c) 900 (d) 800
  8. 8.Which is closest to 800 + 295 + 102? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  9. 9.Round 75.86 to one decimal place. =
  10. 10.Which is closest to 204 + 503 + 896? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  11. 11.Round 13474 to the nearest ten.
  12. 12.Round 10270 to the nearest hundred.
  13. 13.Which is closest to 1392 ÷ 19? (a) 35 (b) 70 (c) 140 (d) 700
  14. 14.Round 46003 to the nearest hundred.
  15. 15.Which is closest to 796 + 297 + 897? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  16. 16.Which is closest to 304 × 31? (Round each number first.) (a) 900 (b) 90000 (c) 18000 (d) 9000
  17. 17.Which is closest to 801 × 41? (Round each number first.) (a) 32000 (b) 64000 (c) 3200 (d) 320000
  18. 18.Round 95056 to the nearest ten.
  19. 19.Which is closest to 199 × 19? (Round each number first.) (a) 8000 (b) 40000 (c) 400 (d) 4000
  20. 20.Which is closest to 296 + 899 + 197? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  21. 21.Which is closest to 202 × 91? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  22. 22.Round 17.34 to one decimal place. =
  23. 23.Which is closest to 97 + 898 + 505? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  24. 24.Which is closest to 196 + 702 + 798? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  25. 25.Round 26.38 to one decimal place. =
  26. 26.Which is closest to 496 + 296 + 505? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  27. 27.Round 54795 to the nearest thousand.
  28. 28.Which is closest to 699 × 51? (Round each number first.) (a) 70000 (b) 350000 (c) 35000 (d) 3500
  29. 29.Which is closest to 804 × 69? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  30. 30.Which is closest to 901 × 42? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  31. 31.Which is closest to 701 × 30? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  32. 32.Which is closest to 400 + 696 + 896? (a) 2000 (b) 1900 (c) 2200 (d) 2100
  33. 33.Which is closest to 801 + 498 + 305? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  34. 34.Round 47.68 to one decimal place. =
  35. 35.Which is closest to 1397 ÷ 21? (a) 140 (b) 35 (c) 70 (d) 700
  36. 36.Round 23.39 to one decimal place. =
  37. 37.Round 21.21 to one decimal place. =
  38. 38.Round 85.32 to one decimal place. =
  39. 39.Which is closest to 2400 ÷ 31? (a) 80 (b) 800 (c) 40 (d) 160
  40. 40.Round 12957 to the nearest ten.

Answer key

  1. 24000
  2. 13000
  3. 42600
  4. 20
  5. 14300
  6. 30000
  7. 900
  8. 1200
  9. 75.9
  10. 1600
  11. 13470
  12. 10300
  13. 70
  14. 46000
  15. 2000
  16. 9000
  17. 32000
  18. 95060
  19. 4000
  20. 1400
  21. 18000
  22. 17.3
  23. 1500
  24. 1700
  25. 26.4
  26. 1300
  27. 55000
  28. 35000
  29. 56000
  30. 36000
  31. 21000
  32. 2000
  33. 1600
  34. 47.7
  35. 70
  36. 23.4
  37. 21.2
  38. 85.3
  39. 80
  40. 12960

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