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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 646 · 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 2497 ÷ 51? (a) 25 (b) 500 (c) 100 (d) 50
  2. 2.Round 27193 to the nearest hundred.
  3. 3.Which is closest to 399 × 42? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  4. 4.Round 46.89 to one decimal place. =
  5. 5.Round 70602 to the nearest hundred.
  6. 6.Which is closest to 604 × 80? (Round each number first.) (a) 4800 (b) 480000 (c) 96000 (d) 48000
  7. 7.Round 51120 to the nearest hundred.
  8. 8.Round 97.49 to one decimal place. =
  9. 9.Which is closest to 502 × 19? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
  10. 10.Which is closest to 404 × 52? (Round each number first.) (a) 20000 (b) 200000 (c) 40000 (d) 2000
  11. 11.Which is closest to 297 × 68? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  12. 12.Which is closest to 499 + 395 + 795? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  13. 13.Which is closest to 2495 ÷ 49? (a) 25 (b) 100 (c) 50 (d) 500
  14. 14.Round 93.13 to one decimal place. =
  15. 15.Which is closest to 998 ÷ 49? (a) 10 (b) 200 (c) 40 (d) 20
  16. 16.Round 46919 to the nearest hundred.
  17. 17.Which is closest to 595 + 403 + 498? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  18. 18.Which is closest to 203 + 699 + 104? (a) 1100 (b) 1200 (c) 1000 (d) 900
  19. 19.Which is closest to 603 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  20. 20.Round 98644 to the nearest ten.
  21. 21.Round 50670 to the nearest thousand.
  22. 22.Which is closest to 1493 ÷ 51? (a) 300 (b) 30 (c) 15 (d) 60
  23. 23.Which is closest to 904 + 597 + 797? (a) 2300 (b) 2400 (c) 2500 (d) 2200
  24. 24.Which is closest to 1403 ÷ 21? (a) 140 (b) 700 (c) 35 (d) 70
  25. 25.Which is closest to 601 × 20? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  26. 26.Round 20.14 to one decimal place. =
  27. 27.Which is closest to 703 × 91? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  28. 28.Round 49.23 to one decimal place. =
  29. 29.Round 25.18 to one decimal place. =
  30. 30.Which is closest to 197 + 196 + 602? (a) 900 (b) 1200 (c) 1100 (d) 1000
  31. 31.Which is closest to 2705 ÷ 29? (a) 90 (b) 180 (c) 45 (d) 900
  32. 32.Round 45.08 to one decimal place. =
  33. 33.Round 59.76 to one decimal place. =
  34. 34.Round 33.22 to one decimal place. =
  35. 35.Which is closest to 2004 ÷ 39? (a) 500 (b) 25 (c) 50 (d) 100
  36. 36.Round 78.77 to one decimal place. =
  37. 37.Which is closest to 395 ÷ 19? (a) 10 (b) 20 (c) 200 (d) 40
  38. 38.Round 25789 to the nearest ten.
  39. 39.Which is closest to 1507 ÷ 51? (a) 60 (b) 15 (c) 30 (d) 300
  40. 40.Round 2364 to the nearest thousand.

Answer key

  1. 50
  2. 27200
  3. 16000
  4. 46.9
  5. 70600
  6. 48000
  7. 51100
  8. 97.5
  9. 10000
  10. 20000
  11. 21000
  12. 1700
  13. 50
  14. 93.1
  15. 20
  16. 46900
  17. 1500
  18. 1000
  19. 20
  20. 98640
  21. 51000
  22. 30
  23. 2300
  24. 70
  25. 12000
  26. 20.1
  27. 63000
  28. 49.2
  29. 25.2
  30. 1000
  31. 90
  32. 45.1
  33. 59.8
  34. 33.2
  35. 50
  36. 78.8
  37. 20
  38. 25790
  39. 30
  40. 2000

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