1.1 symbols and expressions
DESCRIPTION
1.1 Symbols and Expressions. Use order of operations Evaluate algebraic expressions. Vocabulary:. Variable: a letter used in math (x, y) that represents the unknown Algebraic Expression : has no = and contains a variable Substituting : replacing the variable with a number - PowerPoint PPT PresentationTRANSCRIPT
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• Use order of operations• Evaluate algebraic expressions
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Variable: a letter used in math (x, y) that represents the unknown
Algebraic Expression: has no = and contains a variable
Substituting: replacing the variable with a number
Evaluate: substitute a number in for the variable and calculate
Grouping Symbols: Parenthesis ( ), Brackets [ ] or Set Notation { }
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PEMDAS or can it be PEDMSA?1.Parenthesis or any grouping symbols {[( )]}2.Exponents3.Multiplication or Division, which ever comes
first from left to right4.Addition or Subtraction, which ever comes
first from left to rightCan you think of a different way to remember
it besides “please excuse my dear aunt sally” ?
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Try this problem with order of operations Now ignore the order of operations and
just operate from Left to Right Did you get the same answer? That is why you need order of operations!
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When we beginWe begin together
Parenthesis first nowPlease be clever
Exponent come right nextIn line
Then Multiply and Divide At the same time
Now Subtraction and Addition
Walk it out with Computations
It’s the order of operationsIt’s the order of operationsAtion, ation, ation, eh, eh
Eh, eh operations!
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PEMDAS
7 36 4 5
7 936 { }7 14 1
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PEMDAS
231244
44 15 2
44 30 14
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Order of Operations:PEMDAS
2634 4 3 6 2
12 3 15
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Mrs. Rodriguez’s Short Cut to Order of Operations:
-Underline until you get to an addition or subtraction and then lift up your pencil and start again
-This breaks down the problem into little problems
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12 + 3 – 7 ∙ 2 + 812 + 3 – 14 + 815 – 14 + 81 + 8= 9
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1. Substitute what the variable =‘s into the expression
2. Calculate to its simplest terms3. Remember to use the order of operations
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4516 20
5 4
16
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40 5 6 10
5 times “t”
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14 11 25
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8 5 40 410 10
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18 29
369
4
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