[
  "When subtracting a whole number from a decimal, only the ones part changes. The tenths stay the same.",
  "5.9 has 5 ones and 9 tenths. Subtract 3 from the ones: 5 - 3 = 2. The tenths remain 9.",
  "5.9 - 3 = 2.9. Answer: 2.9."
]