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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 414 · 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 301 + 97 + 395? (a) 1000 (b) 700 (c) 900 (d) 800
  2. 2.Round 76283 to the nearest hundred.
  3. 3.Which is closest to 496 × 30? (Round each number first.) (a) 30000 (b) 15000 (c) 1500 (d) 150000
  4. 4.Which is closest to 599 + 704 + 400? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  5. 5.Round 28470 to the nearest thousand.
  6. 6.Round 91728 to the nearest hundred.
  7. 7.Which is closest to 298 + 500 + 801? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  8. 8.Round 29.08 to one decimal place. =
  9. 9.Which is closest to 405 + 596 + 600? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  10. 10.Which is closest to 496 × 28? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  11. 11.Round 52.58 to one decimal place. =
  12. 12.Which is closest to 898 × 19? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  13. 13.Round 17228 to the nearest ten.
  14. 14.Which is closest to 599 × 78? (Round each number first.) (a) 4800 (b) 96000 (c) 48000 (d) 480000
  15. 15.Round 51730 to the nearest hundred.
  16. 16.Which is closest to 1398 ÷ 19? (a) 70 (b) 35 (c) 140 (d) 700
  17. 17.Which is closest to 1594 ÷ 39? (a) 400 (b) 80 (c) 40 (d) 20
  18. 18.Round 79748 to the nearest hundred.
  19. 19.Which is closest to 896 ÷ 29? (a) 30 (b) 15 (c) 300 (d) 60
  20. 20.Round 90.52 to one decimal place. =
  21. 21.Round 45.67 to one decimal place. =
  22. 22.Round 84991 to the nearest ten.
  23. 23.Round 27.51 to one decimal place. =
  24. 24.Round 6074 to the nearest hundred.
  25. 25.Which is closest to 596 + 495 + 597? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  26. 26.Round 61710 to the nearest thousand.
  27. 27.Which is closest to 802 × 90? (Round each number first.) (a) 72000 (b) 720000 (c) 144000 (d) 7200
  28. 28.Which is closest to 1503 ÷ 29? (a) 50 (b) 25 (c) 500 (d) 100
  29. 29.Round 48083 to the nearest thousand.
  30. 30.Which is closest to 2706 ÷ 29? (a) 45 (b) 90 (c) 180 (d) 900
  31. 31.Which is closest to 1203 ÷ 41? (a) 300 (b) 60 (c) 30 (d) 15
  32. 32.Which is closest to 1603 ÷ 21? (a) 160 (b) 80 (c) 40 (d) 800
  33. 33.Which is closest to 1200 ÷ 19? (a) 600 (b) 120 (c) 60 (d) 30
  34. 34.Which is closest to 1495 ÷ 29? (a) 100 (b) 50 (c) 500 (d) 25
  35. 35.Round 75.22 to one decimal place. =
  36. 36.Round 99.34 to one decimal place. =
  37. 37.Which is closest to 297 + 298 + 199? (a) 1000 (b) 700 (c) 900 (d) 800
  38. 38.Round 84.78 to one decimal place. =
  39. 39.Round 47.86 to one decimal place. =
  40. 40.Round 86012 to the nearest ten.

Answer key

  1. 800
  2. 76300
  3. 15000
  4. 1700
  5. 28000
  6. 91700
  7. 1600
  8. 29.1
  9. 1600
  10. 15000
  11. 52.6
  12. 18000
  13. 17230
  14. 48000
  15. 51700
  16. 70
  17. 40
  18. 79700
  19. 30
  20. 90.5
  21. 45.7
  22. 84990
  23. 27.5
  24. 6100
  25. 1700
  26. 62000
  27. 72000
  28. 50
  29. 48000
  30. 90
  31. 30
  32. 80
  33. 60
  34. 50
  35. 75.2
  36. 99.3
  37. 800
  38. 84.8
  39. 47.9
  40. 86010

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