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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 594 · 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 100 + 896 + 104? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  2. 2.Which is closest to 3991 ÷ 51? (a) 80 (b) 800 (c) 160 (d) 40
  3. 3.Which is closest to 799 + 497 + 603? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  4. 4.Round 25768 to the nearest ten.
  5. 5.Which is closest to 97 + 597 + 303? (a) 1200 (b) 1000 (c) 1100 (d) 900
  6. 6.Which is closest to 802 × 29? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  7. 7.Which is closest to 197 + 205 + 795? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  8. 8.Round 87.59 to one decimal place. =
  9. 9.Which is closest to 1193 ÷ 31? (a) 400 (b) 80 (c) 20 (d) 40
  10. 10.Which is closest to 501 + 196 + 702? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  11. 11.Round 44.18 to one decimal place. =
  12. 12.Round 37934 to the nearest ten.
  13. 13.Which is closest to 696 + 499 + 897? (a) 2300 (b) 2100 (c) 2200 (d) 2000
  14. 14.Round 14.13 to one decimal place. =
  15. 15.Which is closest to 696 × 89? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  16. 16.Round 26.22 to one decimal place. =
  17. 17.Which is closest to 401 × 70? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  18. 18.Round 25.86 to one decimal place. =
  19. 19.Round 52372 to the nearest hundred.
  20. 20.Which is closest to 994 ÷ 51? (a) 20 (b) 200 (c) 40 (d) 10
  21. 21.Round 67.83 to one decimal place. =
  22. 22.Round 53653 to the nearest hundred.
  23. 23.Which is closest to 101 + 95 + 296? (a) 600 (b) 500 (c) 400 (d) 700
  24. 24.Round 90.76 to one decimal place. =
  25. 25.Round 92058 to the nearest thousand.
  26. 26.Round 23.63 to one decimal place. =
  27. 27.Which is closest to 204 + 297 + 299? (a) 900 (b) 1000 (c) 800 (d) 700
  28. 28.Round 25.73 to one decimal place. =
  29. 29.Which is closest to 892 ÷ 29? (a) 15 (b) 30 (c) 60 (d) 300
  30. 30.Round 44.66 to one decimal place. =
  31. 31.Which is closest to 1206 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  32. 32.Which is closest to 296 × 72? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  33. 33.Which is closest to 1605 ÷ 41? (a) 40 (b) 80 (c) 20 (d) 400
  34. 34.Which is closest to 900 × 71? (Round each number first.) (a) 6300 (b) 126000 (c) 63000 (d) 630000
  35. 35.Which is closest to 198 × 68? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400
  36. 36.Round 65.53 to one decimal place. =
  37. 37.Which is closest to 398 × 78? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  38. 38.Which is closest to 695 + 205 + 702? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  39. 39.Round 62026 to the nearest ten.
  40. 40.Round 71.64 to one decimal place. =

Answer key

  1. 1100
  2. 80
  3. 1900
  4. 25770
  5. 1000
  6. 24000
  7. 1200
  8. 87.6
  9. 40
  10. 1400
  11. 44.2
  12. 37930
  13. 2100
  14. 14.1
  15. 63000
  16. 26.2
  17. 28000
  18. 25.9
  19. 52400
  20. 20
  21. 67.8
  22. 53700
  23. 500
  24. 90.8
  25. 92000
  26. 23.6
  27. 800
  28. 25.7
  29. 30
  30. 44.7
  31. 60
  32. 21000
  33. 40
  34. 63000
  35. 14000
  36. 65.5
  37. 32000
  38. 1600
  39. 62030
  40. 71.6

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