Use the Language of Algebra: exemplo 1.27

There are two operation words—times tells us to multiply and sum tells us to add.

1. ⓐ Because we are multiplying 5 times the sum we need parentheses around the sum of m and n, $\left(m+n\right).$ This forces us to determine the sum first. (Remember the order of operations.)
   
   $$\begin{array}{}\\ \\ \hfill \text{five times the sum of}m\text{and}n\hfill \\ \hfill 5(m+n)\hfill \end{array}$$
2. ⓑ To take a sum, we look for the words “of” and “and” to see what is being added. Here we are taking the sum of five times m and n.
   
   $$\begin{array}{c}\hfill \text{the sum}\text{of}\text{five times}m\text{and}n\hfill \\ \hfill 5m+n\hfill \end{array}$$