[
  "To divide a fraction by a whole number, multiply the denominator by the whole number: a/b / c = a/(b x c). Then simplify.",
  "3/10 / 9 = 3/(10 x 9) = 3/90. Simplify by dividing numerator and denominator by 3: 3/90 = 1/30.",
  "3/10 / 9 = 1/30. Answer: 1/30 (option C)."
]