[
  "Split the whole-number multiplier into a factor of 10 to make the decimal multiplication easier: 30 = 3 x 10.",
  "1.28 x 3 = 3.84, then 3.84 x 10 = 38.4.",
  "1.28 x 30 = 1.28 x 3 x 10 = 3.84 x 10 = 38.4. Answer: 1.28, 3, 3.84, 38.4."
]