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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 224 · 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 29197 to the nearest ten.
  2. 2.Round 72923 to the nearest ten.
  3. 3.Round 67367 to the nearest hundred.
  4. 4.Which is closest to 602 + 704 + 102? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  5. 5.Which is closest to 4003 ÷ 51? (a) 40 (b) 160 (c) 80 (d) 800
  6. 6.Which is closest to 3208 ÷ 41? (a) 160 (b) 40 (c) 80 (d) 800
  7. 7.Round 62.53 to one decimal place. =
  8. 8.Which is closest to 302 + 897 + 96? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  9. 9.Which is closest to 2093 ÷ 29? (a) 70 (b) 35 (c) 700 (d) 140
  10. 10.Round 81.57 to one decimal place. =
  11. 11.Which is closest to 100 + 498 + 799? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  12. 12.Round 60.06 to one decimal place. =
  13. 13.Round 82082 to the nearest ten.
  14. 14.Round 76.87 to one decimal place. =
  15. 15.Which is closest to 1007 ÷ 51? (a) 40 (b) 10 (c) 20 (d) 200
  16. 16.Which is closest to 197 × 82? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  17. 17.Which is closest to 402 + 105 + 99? (a) 600 (b) 700 (c) 800 (d) 500
  18. 18.Round 99607 to the nearest thousand.
  19. 19.Which is closest to 796 × 69? (Round each number first.) (a) 56000 (b) 560000 (c) 112000 (d) 5600
  20. 20.Round 27155 to the nearest hundred.
  21. 21.Which is closest to 302 × 72? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  22. 22.Which is closest to 995 ÷ 49? (a) 20 (b) 40 (c) 200 (d) 10
  23. 23.Which is closest to 596 ÷ 21? (a) 300 (b) 15 (c) 30 (d) 60
  24. 24.Round 61608 to the nearest thousand.
  25. 25.Which is closest to 395 ÷ 21? (a) 20 (b) 10 (c) 200 (d) 40
  26. 26.Which is closest to 1200 ÷ 19? (a) 30 (b) 60 (c) 120 (d) 600
  27. 27.Which is closest to 702 × 19? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400
  28. 28.Round 62.51 to one decimal place. =
  29. 29.Which is closest to 805 + 95 + 905? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  30. 30.Which is closest to 799 × 70? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  31. 31.Round 93679 to the nearest thousand.
  32. 32.Round 37430 to the nearest hundred.
  33. 33.Which is closest to 799 × 91? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  34. 34.Round 81448 to the nearest thousand.
  35. 35.Which is closest to 502 × 20? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
  36. 36.Which is closest to 1205 ÷ 41? (a) 60 (b) 30 (c) 15 (d) 300
  37. 37.Round 35.81 to one decimal place. =
  38. 38.Which is closest to 501 + 595 + 303? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  39. 39.Round 30312 to the nearest ten.
  40. 40.Which is closest to 598 × 41? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000

Answer key

  1. 29200
  2. 72920
  3. 67400
  4. 1400
  5. 80
  6. 80
  7. 62.5
  8. 1300
  9. 70
  10. 81.6
  11. 1400
  12. 60.1
  13. 82080
  14. 76.9
  15. 20
  16. 16000
  17. 600
  18. 100000
  19. 56000
  20. 27200
  21. 21000
  22. 20
  23. 30
  24. 62000
  25. 20
  26. 60
  27. 14000
  28. 62.5
  29. 1800
  30. 56000
  31. 94000
  32. 37400
  33. 72000
  34. 81000
  35. 10000
  36. 30
  37. 35.8
  38. 1400
  39. 30310
  40. 24000

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