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An expression in math is a sentence with a minimum of two numbers or variables and at least one math operation. This math operation can be addition, subtraction, multiplication, or division. The structure of an expression is: Expression is (Number/variable, Math Operator, Number/variable)

To evaluate an algebraic expression means to find the value of the expression when the variable is replaced by a given number. To evaluate an expression, we substitute the given number for the variable in the expression and then simplify the expression using the order of operations.

A variable is a letter, for example x, y or z, that represents an unspecified number. To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12.

The first step in evaluating an expression is to identify what the given values are for each variable, and then substitute those values into the expression for the variables.

0:00 2:56 7th Grade Evaluating Expressions - YouTube YouTube Start of suggested clip End of suggested clip So I'm gonna rewrite. It. Give it a little hug. So then inside my parentheses I have an exponent.MoreSo I'm gonna rewrite. It. Give it a little hug. So then inside my parentheses I have an exponent.

0:08 6:04 Grade 6 Math #1.7, How to write an algebraic expression - YouTube YouTube Start of suggested clip End of suggested clip Plus three equals five we write x plus 3 equals 5 and x is our variable. See instead of a gray boxMorePlus three equals five we write x plus 3 equals 5 and x is our variable. See instead of a gray box an empty box or an empty line like we used in first grade. We can use variables.

8:34 11:34 How To Evaluate Expressions With Variables Using Order of Operations YouTube Start of suggested clip End of suggested clip And then let's replace y with 3. And then we're going to substitute z with negative 4. 4 times 2 isMoreAnd then let's replace y with 3. And then we're going to substitute z with negative 4. 4 times 2 is 8 2 times 3 is 6. Negative 3 times negative 4 is positive 12. 8 plus 6 is 14 14 plus 12 is 26.