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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 228 · 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 4747 to the nearest hundred.
  2. 2.Which is closest to 196 × 41? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  3. 3.Round 50283 to the nearest thousand.
  4. 4.Which is closest to 400 + 796 + 105? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  5. 5.Round 73.08 to one decimal place. =
  6. 6.Round 38608 to the nearest ten.
  7. 7.Which is closest to 2492 ÷ 51? (a) 500 (b) 25 (c) 100 (d) 50
  8. 8.Which is closest to 705 + 599 + 298? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  9. 9.Which is closest to 1406 ÷ 21? (a) 35 (b) 140 (c) 70 (d) 700
  10. 10.Round 38573 to the nearest hundred.
  11. 11.Round 75568 to the nearest ten.
  12. 12.Which is closest to 2807 ÷ 41? (a) 140 (b) 35 (c) 70 (d) 700
  13. 13.Round 91696 to the nearest ten.
  14. 14.Round 58273 to the nearest hundred.
  15. 15.Round 29.22 to one decimal place. =
  16. 16.Which is closest to 796 × 51? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  17. 17.Round 31.07 to one decimal place. =
  18. 18.Round 71.94 to one decimal place. =
  19. 19.Which is closest to 2404 ÷ 31? (a) 160 (b) 80 (c) 40 (d) 800
  20. 20.Round 73699 to the nearest thousand.
  21. 21.Which is closest to 897 × 62? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  22. 22.Which is closest to 897 + 496 + 503? (a) 2100 (b) 1900 (c) 1800 (d) 2000
  23. 23.Which is closest to 2506 ÷ 51? (a) 500 (b) 100 (c) 25 (d) 50
  24. 24.Which is closest to 1605 ÷ 19? (a) 800 (b) 160 (c) 80 (d) 40
  25. 25.Which is closest to 597 + 400 + 397? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  26. 26.Which is closest to 2400 ÷ 31? (a) 40 (b) 80 (c) 800 (d) 160
  27. 27.Which is closest to 797 + 905 + 496? (a) 2400 (b) 2300 (c) 2100 (d) 2200
  28. 28.Which is closest to 98 + 202 + 100? (a) 400 (b) 600 (c) 300 (d) 500
  29. 29.Which is closest to 804 × 21? (Round each number first.) (a) 16000 (b) 32000 (c) 1600 (d) 160000
  30. 30.Which is closest to 399 + 703 + 104? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  31. 31.Round 69.47 to one decimal place. =
  32. 32.Which is closest to 699 × 50? (Round each number first.) (a) 35000 (b) 70000 (c) 350000 (d) 3500
  33. 33.Which is closest to 696 × 50? (Round each number first.) (a) 70000 (b) 3500 (c) 350000 (d) 35000
  34. 34.Round 98086 to the nearest hundred.
  35. 35.Which is closest to 700 × 22? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  36. 36.Which is closest to 1804 ÷ 29? (a) 600 (b) 30 (c) 60 (d) 120
  37. 37.Round 28773 to the nearest thousand.
  38. 38.Which is closest to 992 ÷ 19? (a) 100 (b) 50 (c) 25 (d) 500
  39. 39.Round 51.31 to one decimal place. =
  40. 40.Which is closest to 299 × 38? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000

Answer key

  1. 4700
  2. 8000
  3. 50000
  4. 1300
  5. 73.1
  6. 38610
  7. 50
  8. 1600
  9. 70
  10. 38600
  11. 75570
  12. 70
  13. 91700
  14. 58300
  15. 29.2
  16. 40000
  17. 31.1
  18. 71.9
  19. 80
  20. 74000
  21. 54000
  22. 1900
  23. 50
  24. 80
  25. 1400
  26. 80
  27. 2200
  28. 400
  29. 16000
  30. 1200
  31. 69.5
  32. 35000
  33. 35000
  34. 98100
  35. 14000
  36. 60
  37. 29000
  38. 50
  39. 51.3
  40. 12000

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