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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 264 · 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.Round 45131 to the nearest thousand.
  2. 2.Which is closest to 3503 ÷ 51? (a) 35 (b) 70 (c) 140 (d) 700
  3. 3.Round 3203 to the nearest ten.
  4. 4.Which is closest to 303 × 80? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  5. 5.Which is closest to 100 + 202 + 196? (a) 400 (b) 600 (c) 700 (d) 500
  6. 6.Which is closest to 401 × 79? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  7. 7.Round 56.77 to one decimal place. =
  8. 8.Which is closest to 295 + 100 + 100? (a) 400 (b) 500 (c) 600 (d) 700
  9. 9.Which is closest to 802 × 50? (Round each number first.) (a) 4000 (b) 40000 (c) 80000 (d) 400000
  10. 10.Which is closest to 596 + 696 + 899? (a) 2100 (b) 2400 (c) 2200 (d) 2300
  11. 11.Round 80.06 to one decimal place. =
  12. 12.Round 21.32 to one decimal place. =
  13. 13.Which is closest to 698 + 397 + 900? (a) 2200 (b) 2100 (c) 2000 (d) 1900
  14. 14.Round 22.47 to one decimal place. =
  15. 15.Round 99693 to the nearest hundred.
  16. 16.Which is closest to 198 × 32? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  17. 17.Round 36.18 to one decimal place. =
  18. 18.Which is closest to 901 × 68? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  19. 19.Which is closest to 798 + 599 + 397? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  20. 20.Round 34.87 to one decimal place. =
  21. 21.Round 18.41 to one decimal place. =
  22. 22.Round 30995 to the nearest thousand.
  23. 23.Round 39104 to the nearest ten.
  24. 24.Round 59.22 to one decimal place. =
  25. 25.Round 29.11 to one decimal place. =
  26. 26.Which is closest to 997 ÷ 49? (a) 20 (b) 200 (c) 40 (d) 10
  27. 27.Which is closest to 805 + 901 + 904? (a) 2500 (b) 2700 (c) 2600 (d) 2800
  28. 28.Round 68531 to the nearest hundred.
  29. 29.Which is closest to 1594 ÷ 21? (a) 160 (b) 800 (c) 40 (d) 80
  30. 30.Which is closest to 599 × 19? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  31. 31.Which is closest to 3597 ÷ 39? (a) 900 (b) 180 (c) 90 (d) 45
  32. 32.Which is closest to 497 × 71? (Round each number first.) (a) 70000 (b) 35000 (c) 350000 (d) 3500
  33. 33.Round 55.28 to one decimal place. =
  34. 34.Round 97323 to the nearest hundred.
  35. 35.Round 44.86 to one decimal place. =
  36. 36.Which is closest to 699 + 695 + 695? (a) 2200 (b) 2100 (c) 2000 (d) 2300
  37. 37.Round 65.37 to one decimal place. =
  38. 38.Round 32.57 to one decimal place. =
  39. 39.Which is closest to 301 × 49? (Round each number first.) (a) 1500 (b) 15000 (c) 150000 (d) 30000
  40. 40.Which is closest to 797 × 30? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400

Answer key

  1. 45000
  2. 70
  3. 3200
  4. 24000
  5. 500
  6. 32000
  7. 56.8
  8. 500
  9. 40000
  10. 2200
  11. 80.1
  12. 21.3
  13. 2000
  14. 22.5
  15. 99700
  16. 6000
  17. 36.2
  18. 63000
  19. 1800
  20. 34.9
  21. 18.4
  22. 31000
  23. 39100
  24. 59.2
  25. 29.1
  26. 20
  27. 2600
  28. 68500
  29. 80
  30. 12000
  31. 90
  32. 35000
  33. 55.3
  34. 97300
  35. 44.9
  36. 2100
  37. 65.4
  38. 32.6
  39. 15000
  40. 24000

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