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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 397 · 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 50894 to the nearest ten.
  2. 2.Which is closest to 202 × 68? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  3. 3.Which is closest to 596 ÷ 31? (a) 40 (b) 200 (c) 20 (d) 10
  4. 4.Which is closest to 398 × 21? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
  5. 5.Which is closest to 993 ÷ 49? (a) 10 (b) 20 (c) 40 (d) 200
  6. 6.Round 26189 to the nearest thousand.
  7. 7.Round 40619 to the nearest ten.
  8. 8.Which is closest to 800 ÷ 19? (a) 20 (b) 40 (c) 80 (d) 400
  9. 9.Round 70.12 to one decimal place. =
  10. 10.Which is closest to 1595 ÷ 41? (a) 40 (b) 400 (c) 80 (d) 20
  11. 11.Round 19815 to the nearest thousand.
  12. 12.Round 30.34 to one decimal place. =
  13. 13.Which is closest to 1609 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  14. 14.Which is closest to 4494 ÷ 51? (a) 900 (b) 90 (c) 180 (d) 45
  15. 15.Which is closest to 704 × 29? (Round each number first.) (a) 21000 (b) 42000 (c) 2100 (d) 210000
  16. 16.Which is closest to 905 + 405 + 305? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  17. 17.Which is closest to 1497 ÷ 31? (a) 100 (b) 50 (c) 500 (d) 25
  18. 18.Round 47.38 to one decimal place. =
  19. 19.Which is closest to 695 + 597 + 202? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  20. 20.Round 25082 to the nearest ten.
  21. 21.Which is closest to 900 × 62? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
  22. 22.Which is closest to 200 × 39? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  23. 23.Which is closest to 606 ÷ 29? (a) 200 (b) 10 (c) 40 (d) 20
  24. 24.Round 11.71 to one decimal place. =
  25. 25.Which is closest to 104 + 98 + 697? (a) 800 (b) 900 (c) 1000 (d) 1100
  26. 26.Round 28188 to the nearest ten.
  27. 27.Round 84.71 to one decimal place. =
  28. 28.Which is closest to 999 ÷ 51? (a) 10 (b) 200 (c) 40 (d) 20
  29. 29.Which is closest to 296 × 60? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  30. 30.Which is closest to 97 + 601 + 402? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  31. 31.Which is closest to 2409 ÷ 31? (a) 40 (b) 160 (c) 800 (d) 80
  32. 32.Round 85.38 to one decimal place. =
  33. 33.Which is closest to 900 + 100 + 797? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  34. 34.Which is closest to 803 ÷ 39? (a) 40 (b) 20 (c) 200 (d) 10
  35. 35.Round 15.31 to one decimal place. =
  36. 36.Round 72.29 to one decimal place. =
  37. 37.Which is closest to 504 × 52? (Round each number first.) (a) 2500 (b) 50000 (c) 25000 (d) 250000
  38. 38.Round 63282 to the nearest ten.
  39. 39.Round 68776 to the nearest ten.
  40. 40.Which is closest to 296 + 100 + 903? (a) 1500 (b) 1400 (c) 1200 (d) 1300

Answer key

  1. 50890
  2. 14000
  3. 20
  4. 8000
  5. 20
  6. 26000
  7. 40620
  8. 40
  9. 70.1
  10. 40
  11. 20000
  12. 30.3
  13. 80
  14. 90
  15. 21000
  16. 1600
  17. 50
  18. 47.4
  19. 1500
  20. 25080
  21. 54000
  22. 8000
  23. 20
  24. 11.7
  25. 900
  26. 28190
  27. 84.7
  28. 20
  29. 18000
  30. 1100
  31. 80
  32. 85.4
  33. 1800
  34. 20
  35. 15.3
  36. 72.3
  37. 25000
  38. 63280
  39. 68780
  40. 1300

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