Variables and Expressions

Variables and Expressions

Learning Objective

I can write an algebraic expression for a word phrase, I can write a word phrase for an algebraic expression.

Lesson Vocabulary

• Quantity- anything that can be measured or counted.

• Variable-is a symbol, usually a letter, that represents the value(s) of a variable quantity. 

• Algebraic Expression- is a mathematical phrase that includes one or more variables. 

• Numerical Expression- is a mathematical phrase involving numbers and operation symbols, but no variables.

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Essential Understanding

Algebra uses symbols to represent quantities that are unknown or that vary. You can represent mathematical phrases and real-world relationships using symbols and operations

Basic Math Terminology

+  Addition- Add, Sum, Plus, Increase,

-  Subtraction, Subtract, Minus, Less, Difference,Decrease, Take Away,     Deduct

×  Multiplication, Multiply, Product, Times

÷  Division, Divide, Quotient, Goes Into, How Many Times

Multiple Choice

Which expression represents

the product of 16 and a number, m?

• 16 + m

• 16 - m

• 16m

• 16/m

Multiple Choice

Which expression represents five times

the difference of a number, n and 3?

• 5n - 3

• 5 ( n - 3 )

• 3 - 5n

• 5 - n - 3

Multiple Choice

The sum of seven and x

• 7x

• 7/x

• 7-x

• 7+x