[
  "Convert the whole number 5 into a mixed number with denominator 10, so you can subtract the fractional part.",
  "5 = 4 10/10. Then 4 10/10 - 1 9/10 = (4 - 1) + (10/10 - 9/10) = 3 + 1/10 = 3 1/10.",
  "Answer: 3 1/10 (option A)."
]