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Variables and Expressions

Learn about numerical and variable expressions, evaluate given expressions, and practice writing variable expressions using different operations.

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Variables and Expressions

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  1. Variables and Expressions

  2. There are types of expressions • a Numerical expression Contains only numbers and operation symbols. Ex: 8 + 5 x 2 • a Variable expression contains at least one variable. Ex: 7 - a + 2 What is a Variable? A symbol usually a letter that stands for an unknown number

  3. Evaluate each expression • x + 12 for x = 8 ___________ = ________ • 80 ÷ c for c = 10 ___________ = ________ • 7 m for m = 5 ___________ = ________ • 10 + 2p for p = 3 ___________ = ________ • k ÷ 2 for k = 22 ___________ = ________ • 2 ( y – 3 ) for y = 12 ___________ = ________

  4. Writing Variable Expressions • Make a list of ALL the words or phrases you can think of that describes each operation: ADDITION SUBTRACTION MULTIPLICATION DIVISION

  5. ADDITION AND SUBTRACTION ADDITION SUBTRACTION

  6. USE your list to describe each numerical expression 5 + 8 10 - 4

  7. MULTIPLICATION AND DIVISION MULTIPLICATION DIVISION

  8. USE your list to describe each numerical expression 10 × 3 18 ÷ 6

  9. Can those same words be used to describe variable expressions?

  10. Write two word phrases for EACH variable expression. • b + 15 2. m – n 3. 6x 4. 18 ÷ p

  11. Writing Variable Expressions • How can we write a variable expression for each word phrase? • Five plus y ________________ • 6 times q ________________ • 2 less than x _______________

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