Numerical and Algebraic Expressions Jean MacIntosh From English to Math Numerical and Algebraic Expressions Jean MacIntosh Show video – You Can Learn Anything, Mind Set, Tell Standards (MP 1,2,6) PPT

Writing Math Expressions A variable is a symbol used to represent a number in an expression or an equation. The value of this number can change. An algebraic expression is a mathematical expression that consists of variables, numbers and operations. The value of this expression can change.

Math Words Translation Guide Math symbol Sum More than Product Times Divided Decreased Twice Less than Increased Per

Example Expression the sum of nine and eight Write each phrase as a mathematical expression.   Phrase Expression the sum of nine and eight the sum of nine and a number x

Example : Expression the sum of nine and eight 9+8 Write each phrase as a mathematical expression. Phrase Expression the sum of nine and eight 9+8 the sum of nine and a number x 9+x

Example 2:   Write each phrase as an algebraic expression using the variable n.   Phrase Expression five more than twice a number the product of a number and 6 seven divided by twice a number    three times a number decreased by 11

Example 3: Write each phrase as an algebraic expression. Phrase   Phrase Expression nine increased by a number x 9+x fourteen decreased by a number p 14-p seven less than a number t 7-n the product of 9 and a number n 9xn thirty-two divided by a number y    32 ÷ y   or   32/y

Example 3: Write each phrase as an algebraic expression. Phrase   Phrase Expression nine increased by a number x 9 + x fourteen decreased by a number p 14 - p seven less than a number t t - 7 the product of 9 and a number n 9 · n   or   9n thirty-two divided by a number y 32 ÷ y    

Example 4: An electrician charges $45 per hour and spends $20 a day on gasoline. Write an algebraic expression to represent his earnings for one day.

Solution: Let x represent the number of hours the electrician works in one day. The electrician's earnings can be represented by the following algebraic expression: Solution: 45x - 20

Independent Practice 1. Fifteen less than twice a number 1.  Fifteen less than twice a number   A 15 - 2x B 2x + 15 C 2x - 15 D None of the above.

2. Three times a number, increased by seventeen A 3(a + 17) B 3a + 17 C (17 + 3)a D None of the above