CHAPTER 1Sections 1 and 2

Math Words

Common Words and Phrases that Indicate Operations

Addition Subtraction Multiplication Division

What’s Your Number

Write down a number Double it. Add 9. Subtract 3. Divide by 2. Subtract your original number.

What’s Your Number

Write down a number. Double it. Add 12. Subtract 4. Divide by 2. Subtract Original Number

Expressions and Variables

Numerical Expression – consists of numbers and operations.

Variable – a letter used to represent one or more numbers.

Variable Expression – consists of numbers, variables, and operations.

You can use a variable expression to generalize a pattern.

Evaluating an Expression

x

Powers and Exponents A power is the result of a repeated

multiplication of the same factor. A power can be written in a form that

has two parts: a number called the base and a number called the exponent.

The exponent shows the number of times the base is used as a factor.

Base

Exponent

Powers and Exponents

Write the product using an exponent.

Evaluating Powers with Variables

Evaluate the expression when

If , evaluate the following expressions.

Formulas and Powers

Area of a square

Volume of a cube

Area of a cirlce

Homework

Pages 7-8#13-39 odd, 51

Pages 12-13#13-33 odd