# How do you translate the words into a mathematical expression: the sum of 3 times m and 9?

$3 \setminus \times m + 9$
First, start with "The sum". That gets you thinking of "$a + b$". Then, you go on with "3 times m", that's gotta be a multiplication: $3 \setminus \times m$. Then, you get to "9". Thus, you see there are 2 separate terms, "9" and "3 times m", which have to be the "$a \mathmr{and} b$" of the original sum.
Hence, we finally have $3 \setminus \times m + 9$.