do now # 8 mon, 9/23
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Do Now # 8 Mon, 9/23. Casey told a secret to two friends and made them promise not to tell anyone. Too bad for Casey, each of those friends each told 2 more friends, and so on. If this continues, how many people find out about Casey’s secret in the eighth round?. - PowerPoint PPT PresentationTRANSCRIPT
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Do Now # 8 Mon, 9/23
• Casey told a secret to two friends and made them promise not to tell anyone. Too bad for Casey, each of those friends each told 2 more friends, and so on. If this continues, how many people find out about Casey’s secret in the eighth round?
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HW Review / Dipstick Quiz
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ORDER OF OPERATIONSLesson 1-4
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In most languages, the meaning of words depend on the order:
ExampleSign the check
Is not the same as
Check the sign
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When you make cereal, do you fill the bowl with milk or cereal first? Why?
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When you get dressed, do you put on your shoes or socks
first? Why?
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In our lives and in MATH, we need to do things in a
certain order to make sure they turn out right.
That is where the ORDER OF OPERATIONS come into play!
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There is a lot going on here…where do we begin?
Left to Right10 + 8 x 6 ÷ 2²
Order of Operations10 + 8 x 6 ÷ 2²
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Why use Order of Operations?
• When an expression has more than one operation, you must know which order to solve them in to arrive at the correct answer.
• To make sure everyone gets the same answer, we use the order of operations.
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Order of OperationsDefinition
The order of operations are a specific set of steps to follow in multi-step problems to ensure that everyone gets the same
final answer.
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Important Vocabulary
• A numerical expression is a mathematical phrase that includes only numbers and operation symbols.
• When you simplify a numerical expression, you are finding its value.
Numerical Expressions 4 + 8 ÷ 2 6 371 – 203 + 2 5,006 19
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Four Rules for Order of Operations
1. Perform calculations inside parentheses first
2. Solve Exponents
3. Perform all multiplication & division from left to right…Multiplication and Division are married
4. Perform all addition and subtraction from left to rightAddition and Subtraction are married
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Add + Subtract -
Multiply x Divide ÷
Please Excuse My Dear Aunt SallyPEMDAS
Parentheses ( ) Exponents 43
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Please Excuse My Dear Aunt Sally
Parentheses ( )
Always do parentheses
1st.
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Please Excuse My Dear Aunt Sally
Exponents 43Always do Exponents
2nd.
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Multiply x Divide ÷
Please Excuse My Dear Aunt Sally
Next, solve all multiplication &
division from left to right
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Add + Subtract -
Please Excuse My Dear Aunt Sally
Finally, end your problem with addition and
subtraction 4th, from left to right.
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PEMDAS HOPSCOTCH
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COMMON ERROR!Be Careful!
PEMDAS is only FOUR STEPS!P – E – MD – AS
It is NOT six steps!P – E – M – D – A – S
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IMPORTANT!!
ALWAYS UNDERLINE the portion of the problem you are solving and BRING DOWN the
remaining parts of the problem!
Your problem should look like an upside down triangle!!
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Example 1
11 + (15 - 3) x 2
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Example 1
11 + (15 - 3) x 2
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Example 26² - 13 + 5 x 2
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Example 350 – ( 16 ÷ 22 ) + 3
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Example 460 ÷12 + 4⁰ x ( 3 x 5)
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Try on your own…
• 5 + 18 ÷ 3² - 1
• 3 x ( 12÷ 4) - 5⁰
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Two More on Your Own
• 4² + 48 ÷ (10 – 4)
• 9 ÷ 3 + 6 x 2³
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Order of OperationsBrochure!!!
• Tri-fold brochure – all 6 panels MUST be filled– Front panel requires title, picture, and name
• Must include step by step order of operations examples• 4 examples (minimum) ranging from simple to difficult (show
all steps of solving!)• One panel must define/describe PEMDAS acronym• 8.5 in by 11 in paper (or construction paper) ONLY• Can be done on computer• BE CREATIVE!!! Use clipart, drawings, or create a theme!• Due on: Wednesday, October 2nd
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Independent Practice
Study Guide and Intervention WorksheetLesson 1-5
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Independent Practice Review