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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 553 · 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 3493 ÷ 51? (a) 700 (b) 70 (c) 35 (d) 140
  2. 2.Which is closest to 3991 ÷ 49? (a) 160 (b) 40 (c) 800 (d) 80
  3. 3.Round 96.12 to one decimal place. =
  4. 4.Which is closest to 198 + 899 + 303? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  5. 5.Round 18.07 to one decimal place. =
  6. 6.Round 27.58 to one decimal place. =
  7. 7.Which is closest to 603 + 95 + 402? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  8. 8.Round 20.67 to one decimal place. =
  9. 9.Which is closest to 697 × 72? (Round each number first.) (a) 98000 (b) 490000 (c) 49000 (d) 4900
  10. 10.Round 71723 to the nearest thousand.
  11. 11.Round 69.36 to one decimal place. =
  12. 12.Which is closest to 901 × 91? (Round each number first.) (a) 810000 (b) 162000 (c) 8100 (d) 81000
  13. 13.Round 9931 to the nearest ten.
  14. 14.Which is closest to 201 × 21? (Round each number first.) (a) 4000 (b) 8000 (c) 40000 (d) 400
  15. 15.Which is closest to 700 + 899 + 895? (a) 2500 (b) 2600 (c) 2700 (d) 2400
  16. 16.Round 45.06 to one decimal place. =
  17. 17.Which is closest to 397 × 42? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  18. 18.Round 51.22 to one decimal place. =
  19. 19.Round 40.13 to one decimal place. =
  20. 20.Round 60217 to the nearest hundred.
  21. 21.Which is closest to 4499 ÷ 51? (a) 900 (b) 45 (c) 90 (d) 180
  22. 22.Round 38582 to the nearest thousand.
  23. 23.Round 59495 to the nearest hundred.
  24. 24.Round 73.59 to one decimal place. =
  25. 25.Round 60.32 to one decimal place. =
  26. 26.Which is closest to 904 + 303 + 699? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  27. 27.Which is closest to 2096 ÷ 29? (a) 140 (b) 700 (c) 35 (d) 70
  28. 28.Round 35518 to the nearest thousand.
  29. 29.Round 23292 to the nearest hundred.
  30. 30.Round 25.12 to one decimal place. =
  31. 31.Which is closest to 298 × 18? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  32. 32.Which is closest to 498 + 98 + 704? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  33. 33.Which is closest to 2008 ÷ 51? (a) 40 (b) 80 (c) 400 (d) 20
  34. 34.Which is closest to 2502 ÷ 51? (a) 50 (b) 100 (c) 500 (d) 25
  35. 35.Which is closest to 3598 ÷ 39? (a) 180 (b) 90 (c) 900 (d) 45
  36. 36.Which is closest to 1609 ÷ 41? (a) 80 (b) 20 (c) 40 (d) 400
  37. 37.Which is closest to 298 × 72? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  38. 38.Round 19063 to the nearest hundred.
  39. 39.Round 71552 to the nearest hundred.
  40. 40.Which is closest to 792 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20

Answer key

  1. 70
  2. 80
  3. 96.1
  4. 1400
  5. 18.1
  6. 27.6
  7. 1100
  8. 20.7
  9. 49000
  10. 72000
  11. 69.4
  12. 81000
  13. 9930
  14. 4000
  15. 2500
  16. 45.1
  17. 16000
  18. 51.2
  19. 40.1
  20. 60200
  21. 90
  22. 39000
  23. 59500
  24. 73.6
  25. 60.3
  26. 1900
  27. 70
  28. 36000
  29. 23300
  30. 25.1
  31. 6000
  32. 1300
  33. 40
  34. 50
  35. 90
  36. 40
  37. 21000
  38. 19100
  39. 71600
  40. 40

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