<p>Not working with something for 10+ years is no excuse to forget math…</p>
<p>My dad grew up during the Cultural Revolution in China in the 60s and was one of the first people to actually attend a university in China after the Cultural Revolution. Before, he only studied until middle school, and he would study one to two years ahead so he could get done quickly.</p>
<p>In college, he studied Biology, but still took a math course. He graduated from university in 1979 and taught for a few years.</p>
<p>He then immigrated to the United States in the early 90s with my mother and sister.</p>
<p>In the U.S., he pursued a Masters and a PhD both unrelated to mathematics.</p>
<p>However, he is better at math than all the math teachers at my school, including math major Calc teachers…</p>
<p>He literally made me tell one of my teachers that she was wrong and he was right, and in fact, he was.
Honestly, there’s a difference between knowing it, teaching it, and both.</p>
<p>I’ve had math teachers in the past who would stop and think for 3 seconds on something as simple as 67 - 43 or something.</p>