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<p>It is besides the point. The OP already specified math as his field. You cannot teach math in a 4-year college with just a masters.</p>
<p>And while there may be “plenty of people” who teach college with a masters, that is only acceptable in very particular fields - fine arts, business, architecture. That’s it. The number of people is irrelevant; the identification of fields is what mattes. And the fields are, as I said, irrelevant to the OP.</p>