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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 727 · 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 59201 to the nearest thousand.
  2. 2.Which is closest to 701 × 71? (Round each number first.) (a) 490000 (b) 4900 (c) 98000 (d) 49000
  3. 3.Which is closest to 606 ÷ 19? (a) 30 (b) 15 (c) 60 (d) 300
  4. 4.Which is closest to 898 × 92? (Round each number first.) (a) 162000 (b) 81000 (c) 8100 (d) 810000
  5. 5.Round 27161 to the nearest thousand.
  6. 6.Round 50939 to the nearest thousand.
  7. 7.Round 57.28 to one decimal place. =
  8. 8.Round 91693 to the nearest hundred.
  9. 9.Round 20252 to the nearest thousand.
  10. 10.Which is closest to 1492 ÷ 51? (a) 300 (b) 30 (c) 60 (d) 15
  11. 11.Which is closest to 701 × 68? (Round each number first.) (a) 490000 (b) 49000 (c) 4900 (d) 98000
  12. 12.Round 65088 to the nearest ten.
  13. 13.Which is closest to 3006 ÷ 51? (a) 120 (b) 600 (c) 30 (d) 60
  14. 14.Which is closest to 604 × 21? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  15. 15.Which is closest to 201 × 69? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  16. 16.Round 22599 to the nearest ten.
  17. 17.Which is closest to 199 × 70? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  18. 18.Round 13.54 to one decimal place. =
  19. 19.Which is closest to 3203 ÷ 39? (a) 40 (b) 160 (c) 800 (d) 80
  20. 20.Which is closest to 297 × 18? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  21. 21.Which is closest to 2402 ÷ 31? (a) 800 (b) 80 (c) 40 (d) 160
  22. 22.Which is closest to 2704 ÷ 31? (a) 180 (b) 45 (c) 900 (d) 90
  23. 23.Which is closest to 302 + 95 + 899? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  24. 24.Round 53.22 to one decimal place. =
  25. 25.Round 16940 to the nearest thousand.
  26. 26.Round 36682 to the nearest hundred.
  27. 27.Round 67915 to the nearest hundred.
  28. 28.Which is closest to 796 × 81? (Round each number first.) (a) 128000 (b) 640000 (c) 6400 (d) 64000
  29. 29.Round 92.49 to one decimal place. =
  30. 30.Round 2698 to the nearest hundred.
  31. 31.Round 77649 to the nearest hundred.
  32. 32.Which is closest to 2792 ÷ 39? (a) 700 (b) 70 (c) 35 (d) 140
  33. 33.Which is closest to 800 × 31? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  34. 34.Round 17.62 to one decimal place. =
  35. 35.Round 3681 to the nearest thousand.
  36. 36.Which is closest to 807 ÷ 19? (a) 400 (b) 40 (c) 20 (d) 80
  37. 37.Round 28.66 to one decimal place. =
  38. 38.Which is closest to 799 ÷ 19? (a) 40 (b) 400 (c) 80 (d) 20
  39. 39.Round 75197 to the nearest ten.
  40. 40.Round 53.92 to one decimal place. =

Answer key

  1. 59000
  2. 49000
  3. 30
  4. 81000
  5. 27000
  6. 51000
  7. 57.3
  8. 91700
  9. 20000
  10. 30
  11. 49000
  12. 65090
  13. 60
  14. 12000
  15. 14000
  16. 22600
  17. 14000
  18. 13.5
  19. 80
  20. 6000
  21. 80
  22. 90
  23. 1300
  24. 53.2
  25. 17000
  26. 36700
  27. 67900
  28. 64000
  29. 92.5
  30. 2700
  31. 77600
  32. 70
  33. 24000
  34. 17.6
  35. 4000
  36. 40
  37. 28.7
  38. 40
  39. 75200
  40. 53.9

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