I CAN Evaluate Algebraic Expressions

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Presentation transcript:

I CAN Evaluate Algebraic Expressions 6th grade Math 6.EE.2c

Vocabulary Variable: a letter that is used to represent a number. Variables are always lowercase letters. Algebraic Expression: a mathematical phrase that has at least one variable; it can contain numbers and operation symbols. It does NOT contain an = sign.

Notes To evaluate an algebraic expression: You replace each variable in the expression with a number or numerical expression Perform all possible mathematical operations following the order of operations. PEMDAS Parenthesis Exponents Multiplication Division Addition Subtraction

Notes Anytime you have a number beside of a variable (example: 3x) or two variables side-by-side (example: xy) ----- this represents multiplication. Anytime you have a variable by itself, there is an understood “invisible” 1 in front of the variable, but you NEVER write the 1. Ex.: 1x is written as just x.

Evaluate each expression. 7b, for b = 5 5 – c, for c = 3 5x + 𝑥 3 , for x = 2 4c – 7 + 2d, for c = 2 and d = 5

More Examples 6 ÷ a + 8, for a = 2 𝑥 2 ÷ 8, for x = 8 3n + 2, for n = 7

The formula P = 2l + 2w gives the perimeter P of a rectangular room with the length l and width w. A rectangular living room is 26 feet long and 21 feet wide. What is the perimeter?

Task Cards Write down the problem once you substitute in for the variable. Then solve.