Reminders: Key signatures are the flat (or sharp) signs at the beginning of an exercise.  They tell you what key you are playing the piece in.  The key of F Major has a B flat in its key signature, so if you’re playing an exercise in F Major, every B you see will actually be a B flat.  Also, remember to use both hands while you play and to avoid writing in any notes.

Secret Question: What notes are flat in the key of B flat major?