157
- = 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
Here is a very easy method for doing long division in your head.
It is very similar to our method of short division. As many people
have trouble doing long division, even with a pen and paper, if you
master this method people will think you are a genius.
Here’s how it works.
Let’s say you want to divide 195 by 32.
Here is how I set up the problem:
32
–2
30 195
We round off 32 to 30 by subtracting 2. Th en we divide both
numbers by 10 by moving the decimal point one place to the left,
making the number we are dividing 19.5 and the divisor 3. Now we
divide by 3, which is easy, and we adjust for the –2 as we go.
CChapter 16hapter 16
DDIRECT IRECT
L LONG DIVISIONONG DIVISION
- = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( )