Japanese
Getting "m + n" on the Decimal Number
If we calculate 7+15 by using the rule of addition, 16 lines are needed.
But in practice, we get the same result spending only 3 or 4 lines.
The reason why this is possible is that we are using decimal numbers.
In the case of the decimal number, by using the "9-9 table" of addition we can get for any two numbers their sum .
Let's recall this reason.
This operation for the decimal number comes from the counting using the decimal-units-system.
(QTmovie 211K)
