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Homedecimal place
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decimal place
A decimal place of a number (a real number) $r$ is the position of a digit in its decimal expansion relative to the decimal point. Let us write $r$ as a decimal number:
$\xymatrix@C=0pt@H=10pt{A_{n}A_{{n1}}\ldots A_{1}&\bullet&D_{1}D_{2}\ldots D_{% m}\ldots\\ &\save*\txt{thedecimalpoint}\restore\ar[u]&}$
where each of the $A_{i}$ and $D_{j}$ is a digit in the decimal system (one of $0,1,2,3,4,5,6,7,8,9$). In this decimal expansion,

the $i$th decimal place to the left of the decimal point is the position of $A_{i}$, and

the $j$th decimal place to the right of the decimal place is the position of $D_{j}$.
The digits $A_{i}$ and $D_{j}$ are called the decimal place values. $A_{i}$ is the decimal place value corresponding to the $i$th decimal place to the left of the decimal point, while $D_{j}$ is the decimal place value corresponding to the $j$th decimal place to the right of the decimal point.
For decimal places closer to the decimal point, specific names are used. Below are some of the most commonly used names:
name  position from  direction from  example 

the decimal point  the decimal point  (position of 7)  
ones  1st  left  $7.2$ 
tens  2nd  left  $71(=71.0)$ 
hundreds  3rd  left  $735(=735.0)$ 
thousands  4th  left  $7126(=7126.0)$ 
tenths  1st  right  $0.7$ 
hundredths  2nd  right  $12.47$ 
thousandths  3rd  right  $9.837$ 
ten thousandths  4th  right  $6.0037$ 
Remark. Instead of saying the $n$th decimal place to the left or right of the decimal point, we simply say the $n$th decimal place to mean the $n$th decimal place to the right of the decimal point, and say $(n)$th decimal place to mean the $n$th decimal place to the left of the decimal point.
For example, in $1632.9758$, the digit $5$ is located on the third decimal place, while $6$ is located on the negative third decimal place.
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Comments
autolinker issue
Because of the appearance of "ones", "tens", etc. in the defines list for this entry, the autolinker is linking the corresponding singulars to this entry as well. I tried to edit the linking policy to prevent this, but whenever I manage to prevent the singulars from linking, the plurals no longer link either. Can anything be done about this?
Re: autolinker issue
Since ones and tens are so common, I could just kill the terms...
Re: autolinker issue
CWoo writes:
> Since ones and tens are so common,
> I could just kill the terms...
Please do. Or use the linking policy to restrict them to a nonexistent MSC classification (which would prevent them from autolinking, while leaving them in the Defines list).