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This is a link post Simbospam! Ancient maths
Sorry for double post but this is very interesting.

Or is it? Fuck off, it is!
(I helped save b3ta! simbosan Hello you cunt, Wed 5 Feb 2020, 0:46, Reply)
This is a normal post Interesting
But none of those methods work if the numbers you start with are fractions.
 (I helped save b3ta! Tusk knows where you live, Wed 5 Feb 2020, 2:09, Reply)
This is a normal post in Russia fractions divide you!

(I helped save b3ta! simbosan Hello you cunt, Wed 5 Feb 2020, 3:46, Reply)
This is a normal post love numberphile
and that's fuckin' witchcraft

Edit: And also, that's Johnny fuckin' Ball!!
 (I helped save b3ta! FridgeBadger, Wed 5 Feb 2020, 12:20, Reply)
This is a normal post I once met Johnny Ball
at Glastonbury festival.

He was just like Johnny Ball. Which was great.

When I met Oliver Postgate, he too was just like Oliver Postgate, which was also great.

Unfortunately, when I met Keith Chegwin, he was just like Keith Chegwin, which was not good at all.
 (I helped save b3ta! My Name was saying these words inside your head on, Thu 6 Feb 2020, 13:43, Reply)
This is a normal post Christ on a bike
Am I happy to see Johnny Ball's still going
 (I helped save b3ta! evil_andy Stick stick stick stick sticky sticky stick stick, Wed 5 Feb 2020, 16:32, Reply)
This is a normal post All of this!
The maths teacher you always wished you had...and actually did have!
 (I helped save b3ta! Happosai _,,,,_(O ; o)_,,,, Wed 5 Feb 2020, 21:14, Reply)
This is a normal post Sirius?

(I helped save b3ta! simbosan Hello you cunt, Wed 5 Feb 2020, 23:26, Reply)
This is a normal post
Do do de, do do doo
 (I helped save b3ta! evil_andy Stick stick stick stick sticky sticky stick stick, Thu 6 Feb 2020, 6:45, Reply)
This is a normal post It's a paper version of doing it in binary on a computer.
Wherever the divide-by-two results in a bit being lost, you add on the steadily doubling number on the other side.
 (I helped save b3ta! joefish It's hard for thee to kick against the pricks, Wed 5 Feb 2020, 16:58, Reply)
This is a normal post it's more to do with nature of binary itself, which goes up by two with each full column
so 7 (binary: 111) x 5 is the same as multiplying by (2,2,2,1)(adding 2x5 + 2x5 + 2x5 and itself together). The column format and rounding down give you a nice way of rationalising this. So 2,2,2,1 becomes 4,2,1. 6 Binary (110) becomes 4,2,0. 10 (binary 1010) 8,0,2,0 instead of 2,2,2,2,2
 (I helped save b3ta! cumquat may will not be commenting further on the allegations, Thu 6 Feb 2020, 12:13, Reply)
This is a normal post 7 is 111 in binary. Not 1111. That's 15.
6 is 110 and 10 is 1010.
So. Err.
 (I helped save b3ta! joefish It's hard for thee to kick against the pricks, Thu 6 Feb 2020, 18:12, Reply)
This is a normal post fucksocks. i realised I'd made an error but pasted over the wrong bit
still, the proof is solid. multiplying something by a binary value means adding double the value with every column, as the binary column represents 2. So his method is breaking one of the factors up into twos (converting to binary), with a handy method of rationalising this.
 (I helped save b3ta! cumquat may will not be commenting further on the allegations, Thu 6 Feb 2020, 23:05, Reply)
This is a normal post Johnny Ball Reveals All...
... Was thankfully only about maths.

And it was brilliant. Great to see him still kicking, although the wandering accent foxed me for a bit
 (GeeFunk, Wed 5 Feb 2020, 22:21, Reply)