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Warm-up Date 09/14/09 Sec 1-1 Variables and Expressions

Warm-up Date 09/14/09 Sec 1-1 Variables and Expressions Complete each equation.

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Warm-up Date 09/14/09 Sec 1-1 Variables and Expressions

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  1. 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 7 12 5 4 3

  2. Date 09/14/09 Sec 1-1 Variables and Expressions

  3. Goal: • To identify variables, numerical expression, and variable expressions. • To write variable expressions for word phrases.

  4. …And Why To use the language of algebra to model real-world problems.

  5. Variable: Is a letter that stands for a number. Variable Expression: Is a mathematical phrase that uses variables, numerals, and operation symbols. Key Words Numerical Expression: Is a mathematical phrase that uses numerals and operation symbols.

  6. Write an expression for each quantity. the number of days in 4 weeks 7 ∙ 4 the number of days in w weeks 7w number of pounds in 160 ounces number of pounds in z ounces

  7. Identify each expression as a numerical expression or a variable expression. a) 8 ÷ x variable expression numerical expression b) 100 × 6 variable expression c) d + 43 – 9

  8. Translate the word phrases into variableexpressions. y + 9 Nine more than a number y n – 4 4 less then a number n A number z times three z · 3, 3z,3(z), or 3 * z A number a divided by 12 a ÷ 12 or a/12 5 times the quantity 4 plus a number c 5 · (4 + c) or 5(4 + c)

  9. Did we achieve our goal? • To identify variables, numerical expression, and variable expressions. • To write variable expressions for word phrases.

  10. On-Line Help Web Site: PhSchool.com Tutor Code: ade-0101 Lesson Quiz Code: ada-0101

  11. Planner: • Write today’s objectives. • Write today’s assignment.

  12. Assignment: • Wk 1-1 • Reflective Journal

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