[
  "Align the decimal points. Subtract hundredths from hundredths, tenths from tenths, column by column.",
  "0.88 - 0.73: 8 hundredths - 3 hundredths = 5 hundredths. 8 tenths - 7 tenths = 1 tenth. Result: 0.15.",
  "0.88 - 0.73 = 0.15. Answer: 0.15."
]