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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 671 · 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 2402 ÷ 41? (a) 120 (b) 30 (c) 600 (d) 60
  2. 2.Which is closest to 202 × 41? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  3. 3.Round 75.17 to one decimal place. =
  4. 4.Which is closest to 596 ÷ 21? (a) 300 (b) 30 (c) 15 (d) 60
  5. 5.Which is closest to 203 × 91? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  6. 6.Round 1217 to the nearest ten.
  7. 7.Which is closest to 398 + 399 + 299? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  8. 8.Which is closest to 199 × 52? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  9. 9.Which is closest to 1008 ÷ 21? (a) 50 (b) 25 (c) 500 (d) 100
  10. 10.Which is closest to 504 × 29? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  11. 11.Round 14989 to the nearest thousand.
  12. 12.Which is closest to 605 + 600 + 202? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  13. 13.Which is closest to 2991 ÷ 51? (a) 30 (b) 60 (c) 600 (d) 120
  14. 14.Which is closest to 1996 ÷ 41? (a) 500 (b) 50 (c) 100 (d) 25
  15. 15.Round 6147 to the nearest ten.
  16. 16.Which is closest to 204 × 22? (Round each number first.) (a) 400 (b) 8000 (c) 40000 (d) 4000
  17. 17.Round 1910 to the nearest hundred.
  18. 18.Round 90273 to the nearest hundred.
  19. 19.Round 42.62 to one decimal place. =
  20. 20.Round 50.71 to one decimal place. =
  21. 21.Round 29.87 to one decimal place. =
  22. 22.Which is closest to 897 + 95 + 202? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  23. 23.Round 97735 to the nearest hundred.
  24. 24.Which is closest to 498 + 698 + 402? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  25. 25.Round 44.14 to one decimal place. =
  26. 26.Which is closest to 1997 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  27. 27.Round 1397 to the nearest ten.
  28. 28.Which is closest to 902 × 71? (Round each number first.) (a) 126000 (b) 630000 (c) 63000 (d) 6300
  29. 29.Which is closest to 897 + 704 + 899? (a) 2400 (b) 2700 (c) 2600 (d) 2500
  30. 30.Which is closest to 698 × 31? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  31. 31.Round 6159 to the nearest hundred.
  32. 32.Which is closest to 1392 ÷ 21? (a) 700 (b) 35 (c) 70 (d) 140
  33. 33.Which is closest to 600 ÷ 21? (a) 300 (b) 30 (c) 15 (d) 60
  34. 34.Which is closest to 3595 ÷ 39? (a) 180 (b) 900 (c) 45 (d) 90
  35. 35.Which is closest to 703 × 42? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  36. 36.Which is closest to 299 × 42? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  37. 37.Which is closest to 1198 ÷ 41? (a) 300 (b) 15 (c) 30 (d) 60
  38. 38.Round 1204 to the nearest ten.
  39. 39.Which is closest to 1605 ÷ 41? (a) 40 (b) 20 (c) 400 (d) 80
  40. 40.Round 80331 to the nearest hundred.

Answer key

  1. 60
  2. 8000
  3. 75.2
  4. 30
  5. 18000
  6. 1220
  7. 1100
  8. 10000
  9. 50
  10. 15000
  11. 15000
  12. 1400
  13. 60
  14. 50
  15. 6150
  16. 4000
  17. 1900
  18. 90300
  19. 42.6
  20. 50.7
  21. 29.9
  22. 1200
  23. 97700
  24. 1600
  25. 44.1
  26. 50
  27. 1400
  28. 63000
  29. 2500
  30. 21000
  31. 6200
  32. 70
  33. 30
  34. 90
  35. 28000
  36. 12000
  37. 30
  38. 1200
  39. 40
  40. 80300

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