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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 608 · 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 197 + 804 + 702? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  2. 2.Which is closest to 397 + 399 + 603? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  3. 3.Round 2526 to the nearest thousand.
  4. 4.Round 44751 to the nearest ten.
  5. 5.Round 96.73 to one decimal place. =
  6. 6.Which is closest to 199 × 41? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  7. 7.Which is closest to 396 ÷ 21? (a) 200 (b) 40 (c) 10 (d) 20
  8. 8.Which is closest to 796 × 88? (Round each number first.) (a) 7200 (b) 72000 (c) 720000 (d) 144000
  9. 9.Which is closest to 596 × 18? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  10. 10.Round 14.94 to one decimal place. =
  11. 11.Round 26624 to the nearest thousand.
  12. 12.Which is closest to 798 ÷ 41? (a) 200 (b) 40 (c) 10 (d) 20
  13. 13.Round 79787 to the nearest hundred.
  14. 14.Which is closest to 600 × 32? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
  15. 15.Which is closest to 195 + 201 + 595? (a) 1100 (b) 900 (c) 1200 (d) 1000
  16. 16.Round 78.83 to one decimal place. =
  17. 17.Round 35116 to the nearest ten.
  18. 18.Which is closest to 701 + 396 + 302? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  19. 19.Round 81.67 to one decimal place. =
  20. 20.Which is closest to 900 + 805 + 203? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  21. 21.Round 30.53 to one decimal place. =
  22. 22.Which is closest to 798 + 95 + 399? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  23. 23.Round 62.71 to one decimal place. =
  24. 24.Which is closest to 503 + 601 + 305? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  25. 25.Which is closest to 1999 ÷ 51? (a) 40 (b) 80 (c) 20 (d) 400
  26. 26.Round 18.52 to one decimal place. =
  27. 27.Round 76898 to the nearest thousand.
  28. 28.Round 77109 to the nearest thousand.
  29. 29.Which is closest to 705 + 805 + 102? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  30. 30.Which is closest to 797 + 900 + 504? (a) 2100 (b) 2200 (c) 2400 (d) 2300
  31. 31.Which is closest to 904 × 60? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
  32. 32.Round 39976 to the nearest thousand.
  33. 33.Which is closest to 3499 ÷ 51? (a) 700 (b) 35 (c) 70 (d) 140
  34. 34.Which is closest to 301 × 42? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  35. 35.Round 39.31 to one decimal place. =
  36. 36.Which is closest to 900 × 78? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  37. 37.Which is closest to 398 × 52? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  38. 38.Which is closest to 400 + 902 + 98? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  39. 39.Which is closest to 105 + 105 + 900? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  40. 40.Which is closest to 1002 ÷ 51? (a) 10 (b) 200 (c) 20 (d) 40

Answer key

  1. 1700
  2. 1400
  3. 3000
  4. 44750
  5. 96.7
  6. 8000
  7. 20
  8. 72000
  9. 12000
  10. 14.9
  11. 27000
  12. 20
  13. 79800
  14. 18000
  15. 1000
  16. 78.8
  17. 35120
  18. 1400
  19. 81.7
  20. 1900
  21. 30.5
  22. 1300
  23. 62.7
  24. 1400
  25. 40
  26. 18.5
  27. 77000
  28. 77000
  29. 1600
  30. 2200
  31. 54000
  32. 40000
  33. 70
  34. 12000
  35. 39.3
  36. 72000
  37. 20000
  38. 1400
  39. 1100
  40. 20

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