Those would be grammatically correct around here, I don't think I ever seen anything like that in the real world. In actual math classes people will usually jus

Those would be grammatically correct around here, I don't think I ever seen anything like that in the real world. In actual math classes people will usually just put parenthesis around numbers: (12, 3), (7, 6), (3,2). Sometimes people will actually replace the comma for the dot to avoid confusion (there's no hard rule set on stone, as long as you're being clear, it's ok). Sometimes people will just space them differently like you did and hope that's clear enough. For dictating, I don't think anyone would dictate the commas between numbers, you would just space them when speaking "twelve comma three.... seven comma six". If you think that's confusing. It's funny to know that we often also use the dot as a multiplication sign. So "12.3,7" actually means "twelve multiplied by 3.7" in english. Btw I'm curious, does other countries also use dot for multiplication or is it only us?