Master numbers; Lex knew those as well.

When you hit the NEWT level you had to know all that basic stuff. It was the difference between a pass and a fail. As luck would have it, she'd managed an 'A' during her OWLs. Nothing left to do but pass them again, yeah? That's really all she had to do. No need for an 'E' or an 'O'. Aurors didn't need this sort of subject. Yes, Alexa had read all about the qualifications and Arithmancy didn't happen to make the cut but she was already taking the class. Her goal was passing. That's really all she wanted.

Hearing the Professor state that she didn't wish for a repetition of information, the Gryffindor could only sit quietly and listen to the others state the things she knew about Master Numbers. There wasn't all that much and not being one of the first to answer, she couldn't guarantee that what she had to say wouldn't be repeated.

Hard life it was, especially when you added numbers.