Today on Math Out Loud we’ll focus on the word variable, v-a-r-i-a-b-l-e. When we first learned about letters when we were young, they were used for reading, writing and spelling. Now that we are older we know that letters can be used in math, too! A variable is aletter in a mathematical expression such as n, x, s, b, or any other letter. The variables are the letters. Numbers are not variables. A variable is a letter that represents aquantity that can change. In an algebraic equation such as x + 3 = 8, the variable is x. The numbers 3 and 8 in that equation are not variables. They are called constants. We’re the Math Masters with the word story of variables on Math Out Loud.