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1-1 Variables and Expressions

1-1 Variables and Expressions. Quantity: Anything that can be measured or counted Variable: a symbol, usually a letter, that represents the value(s) of a variable quantity Algebraic Expression: a mathematical phrase that includes one or more variables

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1-1 Variables and Expressions

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  1. 1-1 Variables and Expressions

  2. Quantity: Anything that can be measured or counted Variable: a symbol, usually a letter, that represents the value(s) of a variable quantity Algebraic Expression: a mathematical phrase that includes one or more variables Numerical Expression: is a mathematical phrase involving numbers and operation symbols, but no variables

  3. Key Words

  4. Problem 1: Writing Expressions with Addition and Subtraction What is an algebraic expression for the word phrase? • 32 more than a number n • 58 less a number n • 18 more than a number n

  5. Do the phrases 6 less a number y 6 less than a number y Mean the same thing?

  6. Problem 2: Writing Expressions with Multiplication and Division What is an algebraic expression for the word phrase? • 8 times a number n • The quotient of a number n and 5

  7. Problem 3: Writing Expressions with Two Operations What is an algebraic expression for the word phrase? • 3 more than twice a number x • 9 less than the quotient of 6 and a number x • The product of 4 and the sum of a number x and 7

  8. Problem 4: Using Words for an Expression What word phrase can you use to represent the algebraic expression

  9. Problem 5: Writing a Rule to Describe a Pattern The table below shows how the height above the floor of a house of cards depends on the number of levels. • What is a rule for the height? Give the rule in words and as an algebraic expression.

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