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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 703 · 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 801 + 295 + 104? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  2. 2.Which is closest to 797 × 91? (Round each number first.) (a) 7200 (b) 144000 (c) 720000 (d) 72000
  3. 3.Which is closest to 3007 ÷ 49? (a) 120 (b) 30 (c) 60 (d) 600
  4. 4.Round 45.59 to one decimal place. =
  5. 5.Round 98.51 to one decimal place. =
  6. 6.Which is closest to 4004 ÷ 51? (a) 160 (b) 40 (c) 800 (d) 80
  7. 7.Round 60.82 to one decimal place. =
  8. 8.Which is closest to 1501 ÷ 29? (a) 500 (b) 25 (c) 50 (d) 100
  9. 9.Round 88.94 to one decimal place. =
  10. 10.Round 24481 to the nearest ten.
  11. 11.Round 71.54 to one decimal place. =
  12. 12.Which is closest to 904 + 297 + 305? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  13. 13.Round 18.94 to one decimal place. =
  14. 14.Which is closest to 2009 ÷ 51? (a) 20 (b) 400 (c) 40 (d) 80
  15. 15.Round 38.61 to one decimal place. =
  16. 16.Round 45901 to the nearest hundred.
  17. 17.Which is closest to 304 × 59? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  18. 18.Round 18.29 to one decimal place. =
  19. 19.Which is closest to 697 + 502 + 205? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  20. 20.Which is closest to 795 + 604 + 901? (a) 2500 (b) 2400 (c) 2200 (d) 2300
  21. 21.Which is closest to 701 × 70? (Round each number first.) (a) 98000 (b) 4900 (c) 490000 (d) 49000
  22. 22.Which is closest to 701 + 303 + 301? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  23. 23.Which is closest to 296 + 496 + 304? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  24. 24.Round 11.14 to one decimal place. =
  25. 25.Round 56592 to the nearest hundred.
  26. 26.Which is closest to 400 + 402 + 205? (a) 1000 (b) 900 (c) 1200 (d) 1100
  27. 27.Which is closest to 602 × 50? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  28. 28.Round 22834 to the nearest thousand.
  29. 29.Which is closest to 398 × 20? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  30. 30.Round 74996 to the nearest thousand.
  31. 31.Which is closest to 396 × 58? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  32. 32.Which is closest to 98 + 599 + 399? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  33. 33.Round 60.06 to one decimal place. =
  34. 34.Which is closest to 3500 ÷ 49? (a) 35 (b) 700 (c) 70 (d) 140
  35. 35.Which is closest to 295 + 305 + 504? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  36. 36.Round 40.46 to one decimal place. =
  37. 37.Round 21.13 to one decimal place. =
  38. 38.Round 9308 to the nearest ten.
  39. 39.Which is closest to 198 × 89? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  40. 40.Round 75.78 to one decimal place. =

Answer key

  1. 1200
  2. 72000
  3. 60
  4. 45.6
  5. 98.5
  6. 80
  7. 60.8
  8. 50
  9. 88.9
  10. 24480
  11. 71.5
  12. 1500
  13. 18.9
  14. 40
  15. 38.6
  16. 45900
  17. 18000
  18. 18.3
  19. 1400
  20. 2300
  21. 49000
  22. 1300
  23. 1100
  24. 11.1
  25. 56600
  26. 1000
  27. 30000
  28. 23000
  29. 8000
  30. 75000
  31. 24000
  32. 1100
  33. 60.1
  34. 70
  35. 1100
  36. 40.5
  37. 21.1
  38. 9310
  39. 18000
  40. 75.8

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