I am a little confused about this specially when answering arithmetic problems. Help me with this: what does "subtract A to B" mean?

  1. A-B
  2. B-A
  • 4
    Subtract A from B is B - A. Subtract A to B is a mistake.
    – Peter
    Sep 30 '20 at 5:30

I'm not sure where you found this sentence, but it's not correct English.

You add one number to another one (in that case, the order doesn't matter). But you subtract a number (A) from another one (B), which means BA. Your source used the wrong preposition. See e.g. Lexico for sample sentences.

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