1 1 Variables and Expressions Quantity Anything that

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 Numerical Expression: is a mathematical phrase involving numbers and operation symbols, but no variables

Key Words Addition Subtraction Multiplication Division Add Subtract Product Quotient Sum Difference Times Divided By Plus Minus Multiplied By More Than Less Than Of Total Decreased By Increased By Take Away Added to Subtracted From

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

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

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

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

Problem 4: Using Words for an Expression •