Theory:

Example:
1. \(r+4\)
 
We can use the addition keywords and form the phrases. 
 
\(r\) is added to \(4\).
 
(or)
 
\(r\) is increased by \(4\).
 
 
2. \(25-s\)
 
We can use the subtraction keywords and form the phrases. 
 
Reduce \(s\) from \(25\).
 
(or)
 
Difference of \(25\) and \(s\).
 
 
3. \(64c\)
 
We can use the multiplication keywords and form the phrases. 
 
The product of \(64\) and \(c\).
 
(or)
 
\(c\) times of \(64\).
 
 
4. \(40/4\)
 
We can use division keywords and form the phrases.
 
\(4\) divides \(40\).
 
(or)
 
The ratio of \(40\) and \(4\).