Presentation on theme: "Variables and Expressions"— Presentation transcript:
1 Variables and Expressions Lesson 11Variables and Expressions
2 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
3 What do expressions look like? Here are some examples5x3c – 74 + p/2Can you give some examples?
4 Writing Expressions - Adding Add 9 and 3 9 + 3The sum of x and 4 x + 4x more than -2 (switch) -2 + x8 plus y 8 + yCan you think of any other words that are the same as adding??
5 Writing Expressions - Subtracting Subtract x from y y – xSubtract x and y x – yThe difference of c and 4 c – 45 less than t (switch) t – 58 minus y 8 – yCan you think of any other words that are the same as subtracting??
6 Writing Expressions - Multiplying Multiply -4 and h -4hThe 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??
7 Writing Expressions - Dividing Divide 8x and 6y 8x ÷ 6yThe quotient of 9 and 3x 9 ÷ 3x5y divided by -2 5y ÷ -2Can you think of any other words that are the same as dividing??
8 Writing Expressions - Exponents A number squared y2The cube (or third power) of a number 3x3Can you think of any other words that are used for exponents??
9 Write the expression for the following PRACTICE TIME!Write the expression for the followingThe sum of a x and 3 times y squared5 decreased x to the third powerThe quotient of 5 plus y and 3 decreased by x8x + 23 ÷ 2y2