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Apostrophe-s: 's ![dot 3](../gifs/dots24/3.gif) ![dots 2-3-4](../gifs/dots24/234.gif)
- When apostrophe-s is used to form the plural or possessive of a mathematical expression, the punctuation indicator must be used before the apostrophe. If the apostrophe is omitted in print, it must be omitted in braille.
- 1's and 2's
![](s1examples/pg20a1.gif)
- How many 10's are there in 50?
![](s1examples/pg20a2.gif)
- Insert +'s or ='s to make true sentences.
![](s1examples/pg20a3.gif)
- 1s and 2s
![](s1examples/pg20a4.gif)
- There are four 4s in 16.
![](s1examples/pg20a5.gif)
- +s or =s
![](s1examples/pg20a6.gif)
- When apsotrophe-s or "s" is attached to a mathematical expression, it becomes part of that expression and must be punctuated mathematically.
- 1's, 2's, and 3's.
![](s1examples/pg20b1.gif)
- 1s, 2s, and 3s.
![](s1examples/pg20b2.gif)
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