Variables and Expressions

In math, you might see a problem that looks like this - 2m + n. The letters (m and n) are called variables. The whole problem is called an expression. To figure out this expression, you need to know what the letters represent. In this case, the m stands for 2 and the n stands for 3. Also, when you see two numbers, or variables, beside each other, that means you multiply them. Now you can figure out the expression.
1. 2m + n
2(2) + 3
4 +3 = 7

2. x = 2.4 y = 4.2
2(x) + y
2(2.4) + 4.2
4.8 + 4.2 = 9