Just seen a neat technique for multiplying large numbers fairly easily.
It visually represents the multiplication so that the result can almost be counted off the page.
It's going to be hard to describe but take 12 x 23 for example.
This can almost be treated in a similar way to a quadratic equation using the FOIL rule...
(10 + 2) x (20 + 3) = 200 + 30 + 40 + 6 = 276
The visual representation is as follows...
So the lines represent the numbers you are multiplying, 12 on the left and 23 on the right.
The red dots represent the result. (If the red dots in a section add to more then 9 then carry the remainder to the left).
You may be able to do it using long division or in your head but for large numbers it's a nice little trick.
