Dan, does "Is (447836)_9 divisible by 10 " mean that the base 10 equivalent of \(\displaystyle 447836_9\) is divisible by 10?

If so \(\displaystyle 447836_9=268224_{10}\)

see here
Sorry I just fail to see the point of the question.

I lived through one technology revolution in which much of traditional topics were rendered obsolete.

Think: learning to graph functions, learning to use partial fractions, learning to sum infinite series, and on and on.

What is now important to know is what each of those implies.