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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 589 · 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 804 + 797 + 99? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  2. 2.Which is closest to 704 × 38? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  3. 3.Round 31452 to the nearest ten.
  4. 4.Round 28420 to the nearest hundred.
  5. 5.Which is closest to 1003 ÷ 51? (a) 200 (b) 10 (c) 40 (d) 20
  6. 6.Which is closest to 201 + 96 + 105? (a) 300 (b) 400 (c) 600 (d) 500
  7. 7.Which is closest to 304 × 40? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  8. 8.Which is closest to 601 × 49? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  9. 9.Which is closest to 303 × 49? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  10. 10.Round 50954 to the nearest hundred.
  11. 11.Round 71578 to the nearest thousand.
  12. 12.Which is closest to 202 + 500 + 405? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  13. 13.Which is closest to 202 × 40? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  14. 14.Round 64676 to the nearest ten.
  15. 15.Round 22222 to the nearest thousand.
  16. 16.Round 68.12 to one decimal place. =
  17. 17.Round 12068 to the nearest thousand.
  18. 18.Which is closest to 496 + 902 + 296? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  19. 19.Round 71312 to the nearest ten.
  20. 20.Round 28.78 to one decimal place. =
  21. 21.Round 68474 to the nearest hundred.
  22. 22.Which is closest to 602 ÷ 31? (a) 10 (b) 40 (c) 200 (d) 20
  23. 23.Which is closest to 2003 ÷ 49? (a) 20 (b) 80 (c) 400 (d) 40
  24. 24.Which is closest to 701 × 49? (Round each number first.) (a) 35000 (b) 350000 (c) 3500 (d) 70000
  25. 25.Which is closest to 95 + 595 + 897? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  26. 26.Round 35.81 to one decimal place. =
  27. 27.Which is closest to 1808 ÷ 21? (a) 900 (b) 90 (c) 180 (d) 45
  28. 28.Round 92177 to the nearest hundred.
  29. 29.Which is closest to 102 + 99 + 895? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  30. 30.Round 48699 to the nearest hundred.
  31. 31.Which is closest to 198 + 102 + 902? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  32. 32.Round 67.23 to one decimal place. =
  33. 33.Which is closest to 601 + 803 + 696? (a) 2300 (b) 2200 (c) 2000 (d) 2100
  34. 34.Round 73.64 to one decimal place. =
  35. 35.Round 29.09 to one decimal place. =
  36. 36.Which is closest to 2401 ÷ 31? (a) 160 (b) 80 (c) 800 (d) 40
  37. 37.Which is closest to 503 × 70? (Round each number first.) (a) 350000 (b) 35000 (c) 3500 (d) 70000
  38. 38.Round 58948 to the nearest thousand.
  39. 39.Round 8461 to the nearest ten.
  40. 40.Round 32.36 to one decimal place. =

Answer key

  1. 1700
  2. 28000
  3. 31450
  4. 28400
  5. 20
  6. 400
  7. 12000
  8. 30000
  9. 15000
  10. 51000
  11. 72000
  12. 1100
  13. 8000
  14. 64680
  15. 22000
  16. 68.1
  17. 12000
  18. 1700
  19. 71310
  20. 28.8
  21. 68500
  22. 20
  23. 40
  24. 35000
  25. 1600
  26. 35.8
  27. 90
  28. 92200
  29. 1100
  30. 48700
  31. 1200
  32. 67.2
  33. 2100
  34. 73.6
  35. 29.1
  36. 80
  37. 35000
  38. 59000
  39. 8460
  40. 32.4

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