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**Variables and Expressions**

Lesson 11 Variables and Expressions

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**Review! Vocabulary Variable:**

a symbol used to represent numbers or values. Algebraic Expression: one or more numbers and variables with one or more arithmetic operations

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**What do expressions look like?**

Here are some examples 5x 3c – 7 4 + p/2 Can you give some examples?

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**Writing Expressions - Adding**

Add 9 and 3 9 + 3 The sum of x and 4 x + 4 x more than -2 (switch) -2 + x 8 plus y 8 + y Can you think of any other words that are the same as adding??

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**Writing Expressions - Subtracting**

Subtract x from y y – x Subtract x and y x – y The difference of c and 4 c – 4 5 less than t (switch) t – 5 8 minus y 8 – y Can you think of any other words that are the same as subtracting??

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**Writing Expressions - Multiplying**

Multiply -4 and h -4h The product of 3x and 7 7(3x) 9t multiplied by -3z 9t(-3z) 8c times -2y (8c)(-2y) Can you think of any other words that are the same as multiplying??

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**Writing Expressions - Dividing**

Divide 8x and 6y 8x ÷ 6y The quotient of 9 and 3x 9 ÷ 3x 5y divided by -2 5y ÷ -2 Can you think of any other words that are the same as dividing??

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**Writing Expressions - Exponents**

A number squared y2 The cube (or third power) of a number 3x3 Can you think of any other words that are used for exponents??

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**Write the expression for the following **

PRACTICE TIME! Write the expression for the following The sum of a x and 3 times y squared 5 decreased x to the third power The quotient of 5 plus y and 3 decreased by x 8x + 2 3 ÷ 2y2

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Variables Symbols used to represent unknown numbers or values.

Variables Symbols used to represent unknown numbers or values.

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