Em 17/01/2014 08:22, George Smith escreveu:
> Apologies for the previous blank response - old age and too many windows=
=20
> open.
>
> I have struggled to test the graphical method multiplying a 2 digit=20
> number by a three digit - e.g 34 x 192.
> And how do you do e.g. 100 x 100?
>
> George Smith


Draw the lines for the first number slanted 45 degrees to the right and
the lines for the second number slanted 45 degrees to the left, this way
the lines from both numbers will cross at right angles. Circle all the
groups of crossings and sum all the groups that are aligned vertically,
writing the totals in a row below the diagram.

For numbers with zeros, draw dashed lines to represent the zeros.

This method can be practical for numbers with low value digits, but is
cumbersome for numbers that have digits in the range 5 to 9.

Isaac

--=20
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