Algebraic Expressions

Unit 7 – Writing Algebraic Expressions with Addition and Subtraction

Vocabulary Terms (of an expression) – part of an algebraic expression separated by addition and/or subtraction Example: 9 w w +10 in the expression above there are 3 terms, 9 w 2, 3 w and 10

Mathematical Phrases AdditionAddition Plus And Total of Altogether Increased by Combined Sum Together **More than (flip-flopper) Added to (flip-flopper) In all SubtractionSubtraction Subtract Gave Take away Decreased by Fewer Minus Fewer than (flip-flopper) **Less than (flip-flopper) Difference Less **Subtracted from (flip- flopper)

Writing Addition Algebraic Expressions - Example Write an algebraic expression for the following scenario. Use a bar model to help you. A box of unknown weight is added to a box whose weight is 10 kilograms. What is the total weight of the two boxes? y + 10 kg

Writing Algebraic Addition Expressions - Example Write an algebraic expression for the following scenario. Use a bar model to help you. The length of a piece of wood is 9 centimeters. The length of another piece of wood is x centimeters. What is the total length of the two pieces of wood? x + 9 cm

Addition Algebraic Expression Practice Write an algebraic expression for each of the following. 1.The sum of 7 and j. 7 + j 2.Kent is 5 years older than Jake. What is Kent’s age in terms of y ? y Michael is 3 years old and Jordan is p years old. What is their total age? 3 + p 4.The sum of m and 10. m + 10

Writing Subtraction Algebraic Expressions - Example Write an algebraic expression for the following scenario. Use a bar model to help you. A shipping box containing a bowling ball has a total mass of 8 kilograms. If the shipping box weighs m kilograms, what is the weight of the bowling ball? 8 – m kg

Writing Subtraction Algebraic Expressions - Example Write an algebraic expression for the following scenario. Use a bar model to help you. Wally is 130 centimeters tall. Tia is b centimeters shorter than Wally. What is Tia’s height? 130 – b cm

Subtraction Algebraic Expression Practice Write an algebraic expression for each of the following. 1.The difference of a and 53 a Alexis had $60 and she spent t dollars. How much money did she have left? 60 - t 3.A small toy shop has m toys for sale in the store. a. Tally buys 5 toys. Write an algebraic expression for the number of toys the shop has left. m – 5 toys b. After Tally leaves the shop, Thomas buys 6 toys. Write an algebraic expression for how many toys the shop has left now. m - 11 toys