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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 946 · 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 801 × 80? (Round each number first.) (a) 6400 (b) 64000 (c) 640000 (d) 128000
  2. 2.Round 57.78 to one decimal place. =
  3. 3.Which is closest to 4491 ÷ 51? (a) 180 (b) 45 (c) 900 (d) 90
  4. 4.Which is closest to 302 + 496 + 297? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  5. 5.Round 12058 to the nearest thousand.
  6. 6.Round 97.17 to one decimal place. =
  7. 7.Round 26738 to the nearest hundred.
  8. 8.Which is closest to 2394 ÷ 39? (a) 120 (b) 600 (c) 30 (d) 60
  9. 9.Which is closest to 503 × 29? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  10. 10.Which is closest to 205 + 301 + 404? (a) 800 (b) 900 (c) 1000 (d) 1100
  11. 11.Which is closest to 3499 ÷ 49? (a) 35 (b) 700 (c) 70 (d) 140
  12. 12.Round 34674 to the nearest ten.
  13. 13.Round 63766 to the nearest thousand.
  14. 14.Which is closest to 203 + 902 + 198? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  15. 15.Round 52.06 to one decimal place. =
  16. 16.Round 52.59 to one decimal place. =
  17. 17.Round 13543 to the nearest ten.
  18. 18.Which is closest to 599 × 31? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  19. 19.Round 27.59 to one decimal place. =
  20. 20.Round 45.86 to one decimal place. =
  21. 21.Which is closest to 297 × 91? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  22. 22.Which is closest to 1197 ÷ 29? (a) 40 (b) 400 (c) 20 (d) 80
  23. 23.Round 53.71 to one decimal place. =
  24. 24.Round 65715 to the nearest hundred.
  25. 25.Round 23.19 to one decimal place. =
  26. 26.Which is closest to 202 × 29? (Round each number first.) (a) 60000 (b) 6000 (c) 600 (d) 12000
  27. 27.Round 19273 to the nearest ten.
  28. 28.Round 44652 to the nearest ten.
  29. 29.Round 86.59 to one decimal place. =
  30. 30.Which is closest to 800 + 697 + 400? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  31. 31.Which is closest to 403 × 18? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  32. 32.Round 71514 to the nearest ten.
  33. 33.Round 11.21 to one decimal place. =
  34. 34.Which is closest to 993 ÷ 51? (a) 10 (b) 200 (c) 20 (d) 40
  35. 35.Which is closest to 901 × 69? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000
  36. 36.Which is closest to 398 + 299 + 497? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  37. 37.Which is closest to 792 ÷ 21? (a) 400 (b) 20 (c) 80 (d) 40
  38. 38.Which is closest to 1396 ÷ 19? (a) 35 (b) 140 (c) 700 (d) 70
  39. 39.Round 12839 to the nearest hundred.
  40. 40.Round 47.08 to one decimal place. =

Answer key

  1. 64000
  2. 57.8
  3. 90
  4. 1100
  5. 12000
  6. 97.2
  7. 26700
  8. 60
  9. 15000
  10. 900
  11. 70
  12. 34670
  13. 64000
  14. 1300
  15. 52.1
  16. 52.6
  17. 13540
  18. 18000
  19. 27.6
  20. 45.9
  21. 27000
  22. 40
  23. 53.7
  24. 65700
  25. 23.2
  26. 6000
  27. 19270
  28. 44650
  29. 86.6
  30. 1900
  31. 8000
  32. 71510
  33. 11.2
  34. 20
  35. 63000
  36. 1200
  37. 40
  38. 70
  39. 12800
  40. 47.1

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