Given two decimal numbers, order as follows:
1. By the number that has a smaller whole number.
2. If they have the same whole part, order by the number that has the smaller decimal part.
Representation of Decimal Numbers
Each decimal number has a place in the numerical straight line. To represent the tenths, divide the unit into 10 parts.
To represent the hundredths, divide each tenth into 10 parts.
To represent the thousandths, divide every hundredth into 10 parts, and this process continues for ten-thousandths, hundred-thousandths, ...
There are no two consecutive decimal numbers, because between two decimal numbers it is always possible to find other decimals.