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Variables and Expressions LESSON 11

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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 – p/2 Can you give some examples?

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WRITING EXPRESSIONS - ADDING 1.Add 9 and The sum of x and 4 x x more than -2 (switch) -2 + x 4.8 plus y 8 + y Can you think of any other words that are the same as adding??

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WRITING EXPRESSIONS - SUBTRACTING 1.Subtract x from y y – x 2.Subtract x and y x – y 3.The difference of c and 4 c – less than t (switch) t – minus y 8 – y Can you think of any other words that are the same as subtracting??

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WRITING EXPRESSIONS - MULTIPLYING 1.Multiply -4 and h -4h 2.The product of 3x and 7 7(3x) 3.9t multiplied by -3z 9t(-3z) 4.8c times -2y (8c)(-2y) Can you think of any other words that are the same as multiplying??

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WRITING EXPRESSIONS - DIVIDING 1.Divide 8x and 6y 8x ÷ 6y 2.The quotient of 9 and 3x 9 ÷ 3x 3.5y 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 1.A number squared y 2 2.The cube (or third power) of a number 3x 3 Can you think of any other words that are used for exponents??

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PRACTICE TIME! Write the expression for the following 1.The sum of a x and 3 times y squared 2.5 decreased x to the third power 3.The quotient of 5 plus y and 3 decreased by x 4.8x ÷ 2y 2

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