Teaching hex/binary/octal/radix part 2

Hopefully this video doesn't fail too hard at life.

Wiki link about radix is here: http://en.wikipedia.org/wiki/Radix

Remember to comment or message me if you're confused or have a question. I'll try to answer them and help you out.

Category:

People & Blogs

Tags:

• radix
• hex
• decimal
• octal
• binary
• math
• teaching

[Shadowlit001]

Are there formulas to go straight from octal to hex and vise versa or do you have to go from octal to decimal to hex or hex to decimal to octal?

Also, is there a formula for multiplying octals(or hexs) with one another or do you have to convert to decimal(or binary) and back again to get the answer?

[acidfingers]

I don't know of any easy way to convert directly from hex to octal or vice versa. There may be some clever way, but I can't think of any off the top of my head.

As far as the multiplying, there are some ways I believe, but they're much different than how we normally perform multiplication on decimal numbers. So I bet it would end up being easier to just convert to decimal and then do the multiplication and convert it back. (That is, unless there's some clever method someone knows out there)

[tankak47]

WOW! im impressed! sitting here reading my network intrusion detection book and couldnt figure out for the life of me how octal worked exactly, I THOUGHT I WOULD NEVER GET IT!

but seriously like 10 mins.

lets see if i can get it..

580dec=1104oct

100oct=64dec

223oct=147dec=93hex

lol that was a nice use of like 10 mins of fingers and scratch paper, but i hope to catch a better grasp soon.

thanks alot! really helped me out

[acidfingers]

Great, looks like you got it all right! Glad I could help you with understanding this octal business :D

[mgsucks]

an $80 text book and a lecturer couldn't explain this to me and thanks to this vid i've learnt it in 10 minutes, cheers man

[acidfingers]

Awesome, I'm glad to hear that this helped you! Go go math :)

[golnar]

thanks, BUDD-AY!!

[JandRLPs]

I got all of them but the last one right. I sat there for a good 10 minutes before I realized hex was base 16 and not base 6

[taralbush]

Thanks! I shared this with my class- Computer System Architecture. It helped alot!! We appreciate your efforts.

[TheILLTechnics]

yo, you look tired. get some rest h4ck3r dude.