Maybe useful if you are teaching to someone who can't understand the classi=
c way.

> From: apptechnz@gmail.com
> Date: Thu, 16 Jan 2014 14:19:21 +1300
> Subject: Re: [OT] Ingenious way to compute multiplications
> To: piclist@mit.edu
>=20
> > What's the name of this strange method?
> > How does it work?
> >
> https://www.facebook.com/photo.php?v=3D1378789205699173&set=3Dvb.13743522=
92809531&type=3D2&theater
>=20
> It's a graphical way of showing the actions that you would do when
> performing the same calculation by other means.
> It gets messy when you get larger digits involved.
>=20
> eg  27 x 63 involves the 6 & 7 lines crossing to give 42 intersections.
> You COULD
>       count all 42 crossings,
> or   add 6, 7 times
> or   add 7, 6 times
> but learning that 6 x 7  =3D 42 is generally easier for most people.
>=20
> If instead of drawing groups of lines you write the pairs of numbers wher=
e
> the line intersections would be and carry out the multiplications of pair=
s
> of single digit from memory then you get the graphical layout advantages =
of
> this method plus the speed gains from remembering your 'times tables'.
>=20
>=20
>     Russell
> --=20
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