9/16/14 Variables & Expressions Textbook: 3-5 V & E DO NOW 1). What is the difference between multiplication and exponents Write and Solve the Following: 2). 34 3). 23 4). 52

Write for one minute on the following question: What is a variable? Thought Question: Write for one minute on the following question: What is a variable? AP

What are we doing Today OBJECTIVE: WE WILL be able to define and translate variables and expressions ESSENTIAL UNDERSTANDINGS: 1). A variable is a value we haven’t yet defined. 2). We can translate math into English. AP

Variables Variables all have values; it is just unknown. A variable is an undefined value. You can use any letter to represent this variable. Most commonly we see X. Why did Malcom X use X as a last name? AP

Translating Expressions An expression is a math phrase. Ex: 3 + 2, 9 x 8, 5X, N – 5 Expressions with a variable are called Variable Expressions. We will be translating these into English. Example: N + 5 = A number plus five. AP

Steps to translating expressions to English 1). A variable is usually translated as “a number” 2). Box the operation and translate that: plus, minus, times, divided by AP

Let’s do these together Translate the expressions: 1). 6x 2). B – 5 3). 6 ÷ Y 4). V + 10 5). 8N 6). 7 ÷ X AP

Translating English into Expressions 1). Underline the operation vocabulary 2). “A Number” translates into a variable Examples: 7 times a number = 7x A number split into 3 = x/3 AP

Translate into expressions 1). A number minus 4 2). 12 times a number 3). Six added to a number 4). 19 divided by a number 5). A number cut into six 6). A number less five 7). Ten with a number added AP

Multi-Operation Expressions The commas indicate parentheses 1). 10 times the sum of a number and three 2). 8 divided by twice a number 3). A number divided by 2, plus six 4). A number plus three, times five =

Now I gave a long HW assignment tonight Start working on it while I call you up individually to discuss your grade and quiz results.