Variables and Expressions

Vocabulary Variable--A symbol, usually a letter of the alphabet, such as the letter n, that is used to represent a number. Algebraic Expression (AKA--Variable Expression)--An expression, such as n – 5, that consists of one or more numbers and variables along with one or more arithmetic operations. (Note: No equal sign) Numerical Expression -- An expression, such as 10-4, that consists of only numbers and one or more arithmetic operations Constant--A specific number whose value does not change

n – 7 + r What kind of expression is this? Algebraic Expression or Numerical Expression Name a variable. What is the 7 called in this expression?

Videos https://www.youtube.com/watch?v=cNsVILErh0M&index=1&list=PLnIkFmW0ticPCGu-khUNJ5OI4OHx-Y696 www.youtube.com/watch?v=Q1jx3PKC1ao www.youtube.com/watch?v=g6jeSuHYhyY

How Do You Describe an Algebraic Expression? Variable Expression Meaning Operation

State the meaning of the variable expression and name the operation

2 times w; Multiplication 7 divided by n; Division 6 plus p; Addition Answer: State the meaning of the variable expression and name the operation Click in the middle of the window to view each answer 8 minus x; Subtraction 2 times w; Multiplication 7 divided by n; Division 6 plus p; Addition You must click on the answer to return to the previous slide

Write the expression 1. 7 plus b 2. 5 more than y 3. 3 minus r 4. 2 less than p 5. x divided by 10 6. 22 divided by m 7. 13 times r