185
- = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( )
% < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9
( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8
9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7
8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6
7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5
6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3
CChapter 19hapter 19
DDIRECT IRECT
M MULTIPLICATIONULTIPLICATION
Everywhere I teach my methods I am asked, how would you multiply
these numbers? Usually I will show people how to use the methods
you have learned in this book, and the calculation is quite simple.
Th ere are often several ways to use my methods, and I delight in
showing diff erent ways to make the calculation simple.
Occasionally I am given numbers that do not lend themselves to my
methods with a reference number and circles. When this happens,
I tell people that I use direct multiplication. Th is is traditional
multiplication, with a diff erence.
MULTIPLICATION WITH A DIFFERENCE
For instance, if I were asked to multiply 6 times 17, I wouldn’t use
my method with the circles, as I think it is not the easiest way to
solve this particular problem. I would simply multiply 6 times 10
and add 6 times 7.
- = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( )