[
  "Align the decimal points. Regroup from tenths to hundredths, and from ones to tenths, when digits are too small.",
  "9.72 - 6.74: 2 hundredths cannot subtract 4, regroup to 12 hundredths. 12 - 4 = 8 hundredths. 6 tenths cannot subtract 7, regroup to 16 tenths. 16 - 7 = 9 tenths. 8 - 6 = 2 ones. Result: 2.98.",
  "9.72 - 6.74 = 2.98. Answer: 2.98."
]