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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 245 · 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 102 + 705 + 103? (a) 1000 (b) 1100 (c) 800 (d) 900
  2. 2.Round 12247 to the nearest thousand.
  3. 3.Round 35710 to the nearest hundred.
  4. 4.Round 61.18 to one decimal place. =
  5. 5.Which is closest to 497 + 605 + 896? (a) 1900 (b) 2100 (c) 2000 (d) 2200
  6. 6.Round 50457 to the nearest ten.
  7. 7.Which is closest to 799 + 301 + 105? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  8. 8.Which is closest to 2004 ÷ 39? (a) 100 (b) 25 (c) 500 (d) 50
  9. 9.Which is closest to 298 + 601 + 801? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  10. 10.Round 30157 to the nearest ten.
  11. 11.Round 63.17 to one decimal place. =
  12. 12.Which is closest to 897 × 40? (Round each number first.) (a) 36000 (b) 72000 (c) 360000 (d) 3600
  13. 13.Which is closest to 704 + 102 + 298? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  14. 14.Round 11938 to the nearest ten.
  15. 15.Round 77.51 to one decimal place. =
  16. 16.Which is closest to 604 × 59? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  17. 17.Which is closest to 1599 ÷ 19? (a) 160 (b) 80 (c) 800 (d) 40
  18. 18.Which is closest to 199 + 96 + 99? (a) 300 (b) 400 (c) 500 (d) 600
  19. 19.Which is closest to 901 + 197 + 802? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  20. 20.Which is closest to 1201 ÷ 31? (a) 40 (b) 80 (c) 20 (d) 400
  21. 21.Round 34.29 to one decimal place. =
  22. 22.Round 88.58 to one decimal place. =
  23. 23.Round 19984 to the nearest hundred.
  24. 24.Which is closest to 603 × 60? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
  25. 25.Round 92.46 to one decimal place. =
  26. 26.Round 82.52 to one decimal place. =
  27. 27.Round 83668 to the nearest ten.
  28. 28.Round 12.88 to one decimal place. =
  29. 29.Round 71.59 to one decimal place. =
  30. 30.Round 22327 to the nearest ten.
  31. 31.Round 80424 to the nearest hundred.
  32. 32.Which is closest to 2409 ÷ 31? (a) 40 (b) 800 (c) 160 (d) 80
  33. 33.Which is closest to 900 + 202 + 599? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  34. 34.Which is closest to 704 × 79? (Round each number first.) (a) 5600 (b) 56000 (c) 560000 (d) 112000
  35. 35.Round 93.84 to one decimal place. =
  36. 36.Which is closest to 1505 ÷ 51? (a) 300 (b) 15 (c) 30 (d) 60
  37. 37.Round 8049 to the nearest thousand.
  38. 38.Which is closest to 1400 ÷ 19? (a) 700 (b) 140 (c) 35 (d) 70
  39. 39.Which is closest to 505 + 797 + 103? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  40. 40.Which is closest to 303 + 497 + 895? (a) 1900 (b) 1800 (c) 1700 (d) 1600

Answer key

  1. 900
  2. 12000
  3. 35700
  4. 61.2
  5. 2000
  6. 50460
  7. 1200
  8. 50
  9. 1700
  10. 30160
  11. 63.2
  12. 36000
  13. 1100
  14. 11940
  15. 77.5
  16. 36000
  17. 80
  18. 400
  19. 1900
  20. 40
  21. 34.3
  22. 88.6
  23. 20000
  24. 36000
  25. 92.5
  26. 82.5
  27. 83670
  28. 12.9
  29. 71.6
  30. 22330
  31. 80400
  32. 80
  33. 1700
  34. 56000
  35. 93.8
  36. 30
  37. 8000
  38. 70
  39. 1400
  40. 1700

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