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Warm Up: Use Chunking and Order of Operations to solve.

Warm Up: Use Chunking and Order of Operations to solve. 1). 3). 2). 4). Learning Target. Read Learning Target #2. Evaluating Algebraic Expression Problems are like this: Evaluate if x = 2 and y = 4

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Warm Up: Use Chunking and Order of Operations to solve.

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  1. Warm Up:Use Chunking and Order of Operations to solve. 1) 3) 2) 4)

  2. Learning Target • Read Learning Target #2. • Evaluating Algebraic Expression Problems are like this: Evaluate if x = 2 and y = 4 Rate your self in the “B” (before) section for LT #2 on how well you can do problems like these.

  3. Evaluating Algebraic Expressions

  4. Expressions An expression is NOT an equation because it DOES NOT have an equal sign. There are 2 types of expressions. • 5 + 84 Numerical • 3x + 10 Algebraic Notice there are no equal signs in these Expression (so they are not equations!)

  5. Numerical Expression • A numerical expression contains • only numbers and symbols. • (5 3) + 8

  6. Algebraic Expression An algebraic expression contains only numbers, symbols, and variables. It is sometimes referred to as a variable expression. • The product of 3 and x 3x • The sum of m and 8 m + 8 • The difference of r and 2 r - 2

  7. What is a variable? A variable represents an unknown value. 1) 3 + ___ = 11 2) 6 + = 8 These are all variables 3) 8 + x = 10 4) 5 + = 9

  8. Variable Expressions Variable expressions consist of constants, variables, and operations. Example Meaning Operation

  9. Evaluate Evaluate means to find the value of an algebraic expression by substituting numbers in for variables. m = 2 8 + m ? 8 + 2 10

  10. Variable Substitution Evaluate the variable expression when n = 6. Substitute. Chunk. Use OOO and PEMDAS to complete 1) 2) Do on whiteboards!

  11. Variable Substitution Evaluate the variable expression when n = 6. Substitute. Chunk. Use OOO and PEMDAS to complete 4) 3)

  12. Variable Substitution Evaluate the variable expression if a = 3 and b = 4. Substitute. Chunk. Use OOO and PEMDAS to complete 1) 2)

  13. Variable Substitution Evaluate the variable expression if a = 3 and b = 4. 5) 6)

  14. Variable Substitution Evaluate the expression if x = 3 and y = 4. 1) 2)

  15. That's all Folks! Take Out Your Learning Targets!!!

  16. TYPES OFEXPRESSIONS LT #2 An expression is NOT an equation because it does not have an equal sign. NUMERICAL EXPRESSION: Contains only numbers and symbols. Example:5 3 + 4 ALGEBRAIC EXPRESSION: Contains numbers, symbols, and variables. Example:m + 8 A VARIABLE is a letter or symbol that represents a number. Example: x

  17. LT #2 Example Problem: Evaluate 4x – 5 + 2(y – 3) When x = 2 and y = 4 4(2) – 5 + 2(4 – 3) Show the substitution 4(2) – 5 + 2(4 – 3) Chunk it 8 – 5 + 2(1) Work within each chunk. 5 Work down. No equal signs. 8 – 5 + __2___ Work within each chunk. 3 + 2 Add/Subtract chunks from left to right.

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