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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 62 · 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 86881 to the nearest ten.
  2. 2.Round 14.11 to one decimal place. =
  3. 3.Which is closest to 197 × 50? (Round each number first.) (a) 100000 (b) 10000 (c) 1000 (d) 20000
  4. 4.Which is closest to 2696 ÷ 31? (a) 900 (b) 180 (c) 45 (d) 90
  5. 5.Which is closest to 1503 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  6. 6.Which is closest to 2000 ÷ 51? (a) 40 (b) 20 (c) 400 (d) 80
  7. 7.Round 24278 to the nearest hundred.
  8. 8.Round 24.61 to one decimal place. =
  9. 9.Which is closest to 3497 ÷ 51? (a) 700 (b) 140 (c) 70 (d) 35
  10. 10.Which is closest to 1799 ÷ 21? (a) 900 (b) 90 (c) 180 (d) 45
  11. 11.Round 59.76 to one decimal place. =
  12. 12.Round 50609 to the nearest hundred.
  13. 13.Round 29897 to the nearest hundred.
  14. 14.Which is closest to 1001 ÷ 19? (a) 100 (b) 50 (c) 500 (d) 25
  15. 15.Round 18909 to the nearest ten.
  16. 16.Round 15.29 to one decimal place. =
  17. 17.Which is closest to 1201 ÷ 19? (a) 30 (b) 120 (c) 600 (d) 60
  18. 18.Which is closest to 896 × 18? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  19. 19.Which is closest to 1508 ÷ 51? (a) 15 (b) 60 (c) 300 (d) 30
  20. 20.Which is closest to 1199 ÷ 19? (a) 600 (b) 30 (c) 120 (d) 60
  21. 21.Which is closest to 101 + 704 + 503? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  22. 22.Round 22698 to the nearest hundred.
  23. 23.Which is closest to 503 × 28? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  24. 24.Which is closest to 699 × 88? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  25. 25.Which is closest to 3192 ÷ 39? (a) 800 (b) 160 (c) 80 (d) 40
  26. 26.Round 13.24 to one decimal place. =
  27. 27.Which is closest to 499 + 299 + 503? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  28. 28.Which is closest to 398 × 52? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  29. 29.Round 16.34 to one decimal place. =
  30. 30.Round 98.63 to one decimal place. =
  31. 31.Which is closest to 595 ÷ 29? (a) 20 (b) 200 (c) 40 (d) 10
  32. 32.Which is closest to 798 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  33. 33.Which is closest to 204 × 38? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
  34. 34.Which is closest to 391 ÷ 19? (a) 200 (b) 40 (c) 20 (d) 10
  35. 35.Which is closest to 696 × 31? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  36. 36.Which is closest to 2705 ÷ 29? (a) 90 (b) 900 (c) 45 (d) 180
  37. 37.Round 47.74 to one decimal place. =
  38. 38.Round 78.11 to one decimal place. =
  39. 39.Which is closest to 105 + 398 + 104? (a) 500 (b) 800 (c) 700 (d) 600
  40. 40.Round 43279 to the nearest hundred.

Answer key

  1. 86880
  2. 14.1
  3. 10000
  4. 90
  5. 30
  6. 40
  7. 24300
  8. 24.6
  9. 70
  10. 90
  11. 59.8
  12. 50600
  13. 29900
  14. 50
  15. 18910
  16. 15.3
  17. 60
  18. 18000
  19. 30
  20. 60
  21. 1300
  22. 22700
  23. 15000
  24. 63000
  25. 80
  26. 13.2
  27. 1300
  28. 20000
  29. 16.3
  30. 98.6
  31. 20
  32. 16000
  33. 8000
  34. 20
  35. 21000
  36. 90
  37. 47.7
  38. 78.1
  39. 600
  40. 43300

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