Constant: A constant is a value that always remains the same value. For example, 7 always means 7, there are always 60 minutes in an hour.
Variable: A variable is a letter or symbol that represents an unknown value. This value can change from problem to problem.
Operation: An operation tells you what type of math you should be doing, addition, subtraction, multiplication or division.
Expression: An expression is made of a constant, operation and variable. For example, 7 + x is an expression. An expression is like a formula and can be used to describe a situation like, I shared x bags of candy evenly among 3 friends.
Equation: An equation includes an equal sign and answer after an expression. For example, 8 - m = 3 is an equation. Now, I know that most of you can quickly realize that m is equal to 5, but for right now, we AREN'T solving these equations, just writing them! Make sure that the variable is part of the "problem" or expression part of the equation.
Words that indicate adding, subtracting, multiplying or dividing:
Examples of expressions from class:
Equations from class:
Since writing equations might be the most confusing, take a look at these pages for additional help, Math Goodies or Math.com.
Tonight's homework is to complete the expressions and equations worksheet.
-Miss K :)