Using Number Disks to understand long division

Why does the long division algorithm work? How can we make it make sense? In this video we use number discs to understand the long division algorithm.
This is really appropriate for 4th and 5th graders.

[rreddy]

I don’t understand why they teach this to students and confuse them in school. This is the most impractical way of teaching division according to me.

However this video is clear now I can explain it to my kid

[Smrt_tt]

Could you go over the check? I already forgot after a whole bunch of lessons.

[queeniezhou]

So cool it helps my son do whatever it is :)

[TheDippymusic]

I think it would have been more clear if you just put the tens in groups of 4, which would have given you 2 groups, and then decompose the one ten as we would in subtraction. Now we have 18 ones and I'm going to repeat step one, and you'd have 4 groups of 4 which is 16, which gives you a remainder of two.

[richardjohnson]

Seriously, my 9 year old 4th grader understands the practical way to workout division. The disc way is nothing but confusing and cumbersome. This serves zero purpose if you need to work something out in your head in real life.
Your explanation does help, but the whole method is unnecessary.

[Meanpooh]

Thank you but this is the most impractical way of doing math. No wonder kids can't graduate. I wonder what else they are teaching.