Warm-up Date 09/14/09

Sec 1-1 Variables and Expressions

Complete each equation.

1) 1 week = ___ days 2) 1 foot = ___ inches 3) 1 nickel = ___ cents 4) 1 gallon = ___ quarts 5) 1 yard = ___ feet

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Date 09/14/09Sec 1-1

Variables and

Expressions

۴ To identify variables, numerical

expression, and variable

expressions.

۴ To write variable expressions for word phrases.

Goal:

To use the language of algebra to model real-

world problems.

…And Why

Variable:Is a letter that stands for

a number.Variable

Expression:Is a mathematical phrase that uses variables,

numerals, and operation symbols.Numerical

Expression:Is a mathematical phrase that uses numerals and

operation symbols.

Write an expression for each quantity.the number of days in 4 weeks

7 ∙ 4

the number of days in w weeks7w

number of pounds in 160 ounces 160

16

number of pounds in z ounces 16

z

Identify each expression as a numerical

expression or a variable expression.a) 8 ÷ x variable

expressionb) 100 × 6 numerical expression

c) d + 43 – 9 variable expression

Translate the word phrases into variable

expressions.Nine more than a number y y + 9

4 less then a number n n – 4

A number z times threez · 3, 3z, 3(z), or 3 * z

A number a divided by 12a ÷ 12 or a/12

5 times the quantity 4 plus a number c5 · (4 + c) or 5(4 + c)

Did we achieve our goal?۴ To identify variables, numerical

expression, and variable

expressions.

۴ To write variable expressions for word phrases.

Web Site: PhSchool.com

Tutor Code: ade-0101

Lesson Quiz Code: ada-0101

On-Line Help

۴ Write today’s objectives.

۴ Write today’s assignment.

Planner:

۴ Wk 1-1

۴ Reflective Journal

Assignment: