 # Variables and Expressions

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Variables and Expressions
Lesson 11 Variables and Expressions

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

What do expressions look like?
Here are some examples 5x 3c – 7 4 + p/2 Can you give some examples?

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??

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??

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??

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??

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??

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